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00

'''00''' is the double zero numeral and may refer to a variety of topics in arts and entertainment, science and technology, and other uses, including in years and telecommunications. For specific meanings, see the sections below.

Arts and entertainment

Gundam franchise

Mobile Suit is a Japanese television series produced by Sunrise, serving as the eleventh installment in the franchise. The series aired in two seasons, with the first season premiering on October 6, 2007, and concluding on March 29, 2008, for a total of 25 episodes, followed by the second season from October 5, 2008, to March 29, 2009, also comprising 25 episodes. Set in A.D. 2307, the narrative centers on , a secretive private armed organization that deploys four advanced mobile suits known as Gundams to forcibly eliminate global conflicts and achieve through intervention. The s in the series are powered by GN Drives, innovative semi-perpetual energy generators that produce GN particles to enable high-output propulsion, beam weaponry, and defensive fields, granting the mobile suits superior mobility and firepower compared to conventional military hardware. Celestial Being's Gundam Meisters pilot these machines in targeted operations against nations and factions perpetuating war, highlighting themes of moral ambiguity in using violence to enforce peace. The "00" designation specifically refers to the GN-0000 00 Gundam, the protagonist unit that combines twin GN Drives for enhanced performance, symbolizing the pinnacle of Celestial Being's technological innovation aimed at revolutionary global change. A related video game adaptation, , was released for the on March 27, 2008, developed and published by Games. This 3D action title allows players to control the four primary Gundam Meisters—, Lockon Stratos, Allelujah Haptism, and Tieria Erde—in mission-based battles that parallel the anime's early plot, emphasizing mobile suit combat mechanics such as sword strikes, missile launches, and beam rifle attacks. The game's structure focuses on strategic unit selection and real-time engagements, providing an interactive extension of the franchise's core emphasis on advanced warfare as a tool for intervention.

Music and literature

In music, "00" refers to a artist who blends beats with melodic elements in his tracks. Notable releases include the single "Feel Right" from 2022, which features over smooth , and "Lean N Percs" from 2024, showcasing his signature flow on themes of street life and . In literature and , "Case 00: The Cannibal Boy" is a 2020 visual novel developed by Sounding Stone under the Physical Exorcism Series. This 30-minute experience draws partly from real events, following an of a isolated boy whose invitation to dinner unravels into themes of loneliness, descent into madness, and the blurred line between reality and . The "Book of Anonymity," edited by the Anon Collective and published in 2021 by punctum books, is an open-access e-book compiling 30 interdisciplinary essays on , , and the societal implications of anonymity. Contributors from fields like , , and explore topics such as , , and platforms like and , emphasizing how anonymity challenges power structures and fosters or hinders social bonds; print editions are available for $27.

Science and technology

Mathematics

In , the expression $0^0 represents an , as direct evaluation leads to conflicting results from limiting behaviors of functions. For instance, considering the limit \lim_{x \to 0^+} x^x = 1, while other approaches like \lim_{x \to 0^+} 0^x = 0 suggest different values, depending on the path taken in the or context. This indeterminacy arises because is not continuously extendable at the origin in a unique way, making $0^0 undefined in rigorous . However, in and , it is conventionally defined as to preserve the structure of formulas, such as the in coefficients where \binom{n}{0} = 1, and the power set of the empty set having exactly one element (the empty set itself). The notation "00" in positional numeral systems, such as base-10, simply denotes the integer zero with an additional digit for alignment or padding, equivalent mathematically to 0 but useful for maintaining place value in multi-digit representations. For example, in solving quadratic equations like x^2 = 0, the solution x = 0 is a double root, indicating multiplicity 2 where the polynomial and its derivative both vanish at that point, emphasizing the repeated zero in the factorization (x - 0)^2 = x^2. This usage highlights zero's role in algebraic multiplicity without altering the equation's value. In applications like numerical computations, leading zeros such as in "00" facilitate padding for fixed-length representations, though this is more practical than theoretical. Historically, the concept of evolved from ancient placeholders, with the earliest known notation appearing in around 3000 BCE as a slanted double wedge inserted between symbols to indicate absence in positional counting, distinguishing it from non-place values. This double-wedge symbol laid the groundwork for zero's integration into algebraic expressions, spreading through Babylonian angled wedges and later Indian dot notation by the 7th century CE, which evolved into the modern oval form to enhance clarity in written . Over time, these developments resolved ambiguities in early scripts, enabling precise representation of equations involving zero.

Engineering and computing

In engineering, particularly within the field of scale modeling, 00-gauge (also written as OO-gauge) represents a standardized scale for model railways designed to simulate prototype standard-gauge tracks with high fidelity. Introduced in 1938 by under the Hornby Dublo brand, it features a scale ratio of approximately :76 (4 mm to 1 foot) in the , paired with a track gauge of 16.5 mm to replicate the 1,435 mm standard gauge of real railways. This configuration allows for detailed, realistic representations of locomotives, , and infrastructure, making it a cornerstone for hobbyist and professional simulations of rail systems. In the United States, the same 16.5 mm is employed but at a finer 1:87 scale under the HO-gauge standard, highlighting regional variations in modeling practices while maintaining of track components. In computing, the use of leading zeros—prefixing numeric values with zeros to achieve a fixed length, such as "00" for two-digit padding—serves as a fundamental practice for data formatting, alignment, and error prevention in programming and digital systems. This technique ensures consistent string lengths in outputs like dates (e.g., "01/01/2023" rather than "1/1/2023"), codes, and identifiers, facilitating reliable parsing, sorting, and display across applications. It gained critical importance in averting issues akin to the Y2K problem, where two-digit year representations without proper padding led to widespread ambiguity in legacy systems; standardizing with leading zeros in date fields helped mitigate rollover errors by enforcing uniform four-digit interpretations post-2000. Languages like C, JavaScript, and .NET provide built-in functions (e.g., printf's %02d or String.padStart()) to implement this padding, underscoring its role in maintaining data integrity in software engineering. Beyond formatting, "00" finds practical applications in engineering software and low-level computing representations. In (CAD) systems, such as , the coordinate (0,0)—often abbreviated as "00" in plotting—defines the point of the world , serving as the absolute reference for all geometric constructions, measurements, and transformations in drafting and modeling workflows. This convention enables precise spatial engineering by anchoring designs to a fixed point, essential for simulations in mechanical and architectural fields. In and logic, double zeros (e.g., 0x00 in or all-zero bit patterns) commonly denote or idle states, such as uninitialized pointers or empty bytes in , distinguishing them from non-zero values to prevent undefined behaviors in hardware and software systems.

Other uses

Clothing and fashion

In American apparel standards, represents the smallest designated size for women's garments in traditional catalog systems, typically corresponding to body measurements of a 31-inch bust, 23-inch waist, and 33-inch hips. This sizing is often equivalent to an XS or in contemporary labeling. The adoption of traces back to 20th-century catalog sizing practices in . These systems emphasized proportional, idealized body shapes but faced criticism for perpetuating unrealistic standards that contributed to pressures and eating disorders among women. Today, size 00 persists in inclusive sizing ranges offered by brands such as Universal Standard, which extends from 00 to 40 to serve diverse body types while maintaining the designation for petite frames. This approach balances historical conventions with broader accessibility in fashion.

Food and cuisine

In Italian culinary tradition, "00" refers to tipo 00 flour, the finest grind of soft wheat flour characterized by its low mineral content and powdery texture. This classification, established under Italian Decree 187/2001, defines tipo 00 flour as having a maximum ash content of 0.55% (calculated per hundred parts of dry substance), making it the most refined option among Italian wheat flours. Sourced exclusively from soft wheat grains with impurities removed through grinding and sifting, tipo 00 distinguishes itself from coarser varieties like tipo 0 (ash content 0.55–0.65%) or tipo 1 (up to 0.80%), which retain more bran and endosperm elements. The production of tipo 00 flour adheres strictly to these legal parameters, emphasizing high refinement to achieve a silky, almost talcum-like consistency that enhances workability. Milled to remove outer layers of the kernel, it typically features a protein content around 9–13%, contributing to its notable development and elasticity without excessive toughness. This results in a versatile base for , where the flour's fine particles allow for smooth incorporation of and rapid . In culinary applications, tipo 00 flour excels in preparations requiring tender yet stretchable doughs, such as , fresh , and delicate pastries. Its high elasticity enables thin, airy crusts that rise quickly in high-heat ovens, while the structure provides the necessary strength for shaping without tearing. For authentic , the Associazione Verace Pizza Napoletana (AVPN) mandates the use of tipo 00 or tipo 0 flour in its international regulations, ensuring a soft, smooth texture and balanced chew that defines the style. In -making, it yields supple sheets or strands that hold shape during boiling, and in pastries, it promotes flakiness by absorbing fats evenly without denseness.

Telecommunications and years

In , "00" serves as the international dialing prefix recommended by the (ITU) for most to initiate direct international calls, excluding those in the which use 011. This is followed by the destination 's code and the subscriber's number, such as 00 44 for the or 00 49 for , facilitating standardized global connectivity. Adopted in the post-World War II period as part of efforts to modernize , the "00" gained widespread use following the ITU's establishment of codes in the early 1960s, enabling automated across networks in , the , and many other regions. Years ending in "00" denote centennial or millennial transitions in the , often carrying historical or cultural significance. For example, 1900 marked the close of the , a period of industrial and imperial expansion. The year , while technically the end of the , was celebrated as the dawn of the third millennium and highlighted by the (, where software systems using two-digit formats risked misinterpreting "00" as 1900 instead of 2000, prompting global remediation efforts from 1999 onward to prevent failures in on January 1, 2000. In this context, leading zeros in fields exacerbated the ambiguity, as systems like "01/01/00" could default to an erroneous prior century. Looking ahead, 2100 is projected as a key marker for climate change impacts, with models forecasting—as of the (2021)—global temperature rises of 2.0–4.4°C above pre-industrial levels and increases of 0.28–1.01 m under medium-to-high emissions scenarios (SSP2-4.5 to SSP5-8.5), potentially higher in extreme cases. Earlier centuries like 1800 also signified shifts, such as the end of the amid revolutionary changes in and the . Under rules, years ending in "00" are not unless divisible by 400, making 1900 and 2100 common years of 365 days without , whereas 2000 qualified as a due to its divisibility by 400. This century rule, introduced in to refine alignment, ensures the averages 365.2425 days per year over 400-year cycles.

References

  1. [1]
    Y2K | National Museum of American History
    The term Year 2000 bug, also known as the millennium bug and abbreviated as Y2K, referred to potential computer problems which might have resulted when dates ...
  2. [2]
    U.S. History Timeline: The New Millennium - 2000 onward - InfoPlease
    Sep 13, 2021 · Find major events in US History from 2000 through the present, including the September 11, 2001, terrorist attack, the historical election of Barack Obama, the ...Missing: summary | Show results with:summary
  3. [3]
    Human Genome Project Fact Sheet
    Jun 13, 2024 · In June 2000, the International Human Genome Sequencing Consortium announced that it had produced a draft human genome sequence that accounted ...
  4. [4]
    Sydney 2000 Olympic Games | Facts, Results, Opening Ceremonies ...
    The Sydney 2000 Olympic Games were an athletic festival held in Sydney that took place September 15–October 1, 2000.
  5. [5]
    Historical Events in 2000 - On This Day
    Historical Events in 2000 · Santa Maria Maggiore · Belichick Rejects NY Jets · Marino's Last Game · Gates Steps Aside · Sports History · Jordan Wizard's Part Owner.May · March · June · 2001Missing: summary | Show results with:summary
  6. [6]
    USS Cole Bombing - FBI.gov
    On October 12, 2000, suicide terrorists exploded a small boat alongside the USS Cole as it was refueling in the Yemeni port of Aden, killing 17 American ...
  7. [7]
    MOBILE SUIT GUNDAM 00 1st season｜List of Works｜SUNRISE
    Title: MOBILE SUIT GUNDAM 00 1st season ; Year of Production: October 06, 2007 ; Number of Episodes: 25 ; Synopsis. A.D. 2307. Orbital elevators have been ...Missing: anime 2007-2009
  8. [8]
    https://store.steampowered.com/app/1391450/Case_00_The_Cannibal_Boy/
  9. [9]
    GN-0000 00 Gundam - The Gundam Wiki - Fandom
    The GN-0000 00 Gundam was one of the new Gundams developed by Celestial Being after the paramilitary organization was defeated by the UN Forces in AD 2308.GN-0000DVR Gundam 00 Diver · 00 XN Raiser
  10. [10]
    https://punctumbooks.com/titles/book-of-anonymity/
  11. [11]
    00 - Songs, Events and Music Stats | Viberate.com
    Lean N Percs. 183 streams last week. 641. Streams ... Feel Right. 00. 112. Streams last week. Play. Love ... With their most recent tracks and albums, Canadian Hip ...
  12. [12]
    ‎Feel Right - Single - Album by 00 - Apple Music
    Listen to Feel Right - Single by 00 on Apple Music. 2022. 1 Song. Duration: 2 minutes ... Feel Right - Single. 00. HIP-HOP/RAP · 2022. Preview. Song. Time.
  13. [13]
    00 - Oppblock MP3 Download & Lyrics | Boomplay
    Lean N Percs | Boomplay Music. Lean N Percs. Hold Me Down | Boomplay Music ... Feel Right | Boomplay Music. Feel Right. Listen to 00Oppblock MP3 song ...
  14. [14]
    Case 00: The Cannibal Boy on Steam
    Rating 3.5 (139) · 14-day returnsCase 00: The Cannibal Boy is a half-hour visual novel partly based on a true story, written by a writer with a background in psychology.
  15. [15]
    Anjian 00: Shiren Xiaonanhai | vndb
    Anjian 00: Shiren Xiaonanhai ; Titles. 案件00：食人小男孩. Anjian 00: Shiren Xiaonanhai. Case 00: The Cannibal Boy. ケース00：人食いくん. Case 00: Hitokui-kun.
  16. [16]
    Book of Anonymity – punctum books
    $$27.00Mar 4, 2021 · Marx, M.I.T.. Book of Anonymity. Edited by Anon Collective. Contributors Anon, Götz Bachmann, Dwaipayan Banerjee, Solon Barocas, Aram ...
  17. [17]
    Book of Anonymity
    Book of Anonymity. Anon Collective. punctum books. 2021-03-04. CC BY-NC-SA. Anonymity is highly contested, marking the limits of civil liberties and legality ...
  18. [18]
    4:00 a.m. (Henry Bins #7) by Nick Pirog | Goodreads
    Rating 5.0 (6) Jan 1, 2024 · People · Sign in · Sign up. Jump to ratings and reviews. Want to Read. Buy on Amazon. Rate this book. 4:00 a.m.. Nick Pirog. 5.00. 6 ratings2 ...
  19. [19]
    3 a.m. Premium: Books 1-5 (The Henry Bins Series) - Amazon.com
    3:00 a.m.-4:00 a.m. It's the wedding that everyone has been waiting for What could possibly go wrong? Read more. About the Author. Nick Pirog is the #1 Amazon ...
  20. [20]
    Power -- from Wolfram MathWorld
    0^a is always 0 (for a>0 ), so 0^0 should equal 0. The choice of definition for 0^0 is usually defined to be indeterminate, although defining 0^0=1 allows ...
  21. [21]
    Double Root - Mathwords
    Double Root. A root of a polynomial equation with multiplicity 2. Also refers to a zero of a polynomial function with multiplicity 2.<|separator|>
  22. [22]
    [PDF] 1.7. Positional Numeral Systems
    Jun 4, 2023 · A positional numeral system has a base b > 1 and a set of basic symbols for 0,1,2,...,b − 1. The b basic symbols are called the digits of the.
  23. [23]
    What Is the Origin of Zero? | Scientific American
    Jan 16, 2007 · The first evidence of zero is from Sumerian culture, using a slanted double wedge. It spread to Babylonians, then India, and then to the West.
  24. [24]
    A History of OO Gauge - The Double O Gauge Association
    Meccano responded by developing their own 00-gauge range, Hornby Dublo “The general scale of the models will be 4mm to the foot, but the track will conform to ...
  25. [25]
    https://www.theguardian.com/theobserver/she-said/2014/jul/17/size-triple-zero-why-wont-our-obsession-with-super-skinny-disappear
  26. [26]
    https://www.universalstandard.com/pages/find-my-size
  27. [27]
    How to: Pad a Number with Leading Zeros - .NET - Microsoft Learn
    Sep 8, 2022 · You can add leading zeros to both integer and floating-point numbers by using a custom numeric format string. This article shows how to use both methods to pad ...
  28. [28]
    [PDF] Y2K problem - Computer History Museum - Archive Server
    Apr 1, 1971 · This proposed American National Standard presents a standard representation for a calendar date for use in the interchange of data from machine- ...<|control11|><|separator|>
  29. [29]
    printf - Printing leading 0's in C - Stack Overflow
    Sep 30, 2008 · Use `printf("%05d", zipCode)` to print leading zeros. The 0 pads with zeros, and 5 sets the width. `printf("%.5d", zipCode)` is another option.How to convert an Int to a String of a given length with leading zeros ...Pad with leading zeros to common width [duplicate] - Stack OverflowMore results from stackoverflow.comMissing: Y2K | Show results with:Y2K
  30. [30]
    COORDINATE SYSTEMS IN AUTOCAD - The CAD Masters
    Absolute coordinate entry is the default. Absolute coordinate entry always counts from the origin. When drawing lines, AutoCAD is ready to place the next vertex ...
  31. [31]
    [PDF] Number Systems and Number Representation - cs.Princeton
    Sep 12, 2019 · Most (digital) computers use the binary number system. Terminology ... - two representations of zero. - need different algorithms to add.
  32. [32]
    US Standard Clothing Size | PDF | Anthropometry - Scribd
    Rating 5.0 (1) Nov 12, 2016 · Misses sizes (ASTM D5585 11e1)[3] (2011). 5'5" tall. Dimension/size 00 0 2 4 6 8 10 12 14 16 18 20 ... as waist lengths. Standards Current and ...
  33. [33]
    The Bizarre History of Women's Clothing Sizes - Time Magazine
    Oct 23, 2014 · “True sizing standards didn't develop until the 1940's,” says Lynn Boorady, fashion and textile technology chair and associate professor at ...
  34. [34]
    Size and Measurement Charts - Lehigh Library Exhibits
    Luckily, Sears provided size charts for every garment they sold in their catalogs, many of which can be seen here. Sears tended to categorize women's sizes by ...Missing: historical | Show results with:historical
  35. [35]
    Size triple zero: why won't our obsession with super skinny disappear?
    Jul 17, 2014 · It implies that the world's obsession with skinny and its impact on women's body image had gone away and was only now returning. It hadn't ...
  36. [36]
    https://astro101.wwu.edu/a101_leapyear.html
  37. [37]
    [PDF] ITALY 1. LEGISLATION IN FORCE (unofficial translation) - UN.A.F.P.A.
    Jul 1, 2001 · 5. Type 00 flour may also be produced in granular form (soft wheat semolina). 6. Type 1 flour may not contain more than 0.1 percent of the ...Missing: classification | Show results with:classification
  38. [38]
    [PDF] AVPN International Regulations
    Wheat flour type “00”/ flour type “0”*: a small amount of wheat flour ... production process of the “Verace Neapolitan Pizza” (Vera Pizza. Napoletana) ...
  39. [39]
    00 Flour Explained: What Is 00 Flour? - 2025 - MasterClass
    Oct 27, 2021 · 00 flour, or doppio zero, is a finely ground Italian flour used for pasta and pizza dough, known for its high elasticity and fine texture.Missing: Decree 187/2001<|separator|>
  40. [40]
    [PDF] Numbering trends – a global overview Executive summary ... - ITU
    Dec 20, 2002 · • The international dialling prefix 00 is now very widespread. ... which has become almost an international de facto standard for freephone.
  41. [41]
    The Most Accurate List of International Call Prefixes
    Country Name, Dial Out Code, Country Code / International Prefix ; Afghanistan, 00, +93 ; Albania, 00, +355 ; Algeria, 00, +213 ; American Samoa, 011, +1 (684) ...
  42. [42]
    How Americans prepared for Y2K - NPR
    Dec 28, 2024 · It all stemmed from a seemingly small software glitch: Many older computer programs had coded dates using only two numbers for the year. At ...
  43. [43]
    NASA Releases Detailed Global Climate Change Projections
    Jun 9, 2015 · NASA has released data showing how temperature and rainfall patterns worldwide may change through the year 2100 because of growing concentrations of greenhouse ...Missing: milestones | Show results with:milestones
  44. [44]
    The mathematical muddle created by leap years - BBC
    Feb 28, 2024 · Every four years we have a 29 February – apart from those at the turn of a century, unless the year is divisible by 400.
  45. [45]
    Leap Year | Western Washington University
    There is a leap year every year whose number is perfectly divisible by four - except for years which are both divisible by 100 and not divisible by 400.