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LB

lb is the standard symbol for the avoirdupois , a unit of mass in the United States customary and imperial systems of measurement, defined as exactly 0.45359237 kilograms. Originating from ancient practices, the term "pound" derives from the Latin libra pondo, where libra denoted a balance scale for weighing approximately twelve unciae (ounces), establishing a foundational standard for trade and commerce that persisted through medieval into modern systems. The pound, distinguished from the lighter pound used for precious metals, was formalized in through acts like the 1824 Weights and Measures Act, which standardized it at 7,000 grains, and later aligned internationally via the 1959 agreement between the , , and other nations to ensure equivalence with the for global consistency. Despite widespread adoption of the elsewhere, the remains integral to American industries, consumer products, and personal metrics such as body weight, underscoring its enduring practical utility amid ongoing debates over . The abbreviation "lb" evolved from scribal contractions of , often rendered with a bar over the "l" to indicate , a convention that bypassed the letter "p" in "pound" to preserve the Latin root.

Measurement and units

Pound (lb)

The abbreviation "lb" for the pound derives from the Latin phrase libra pondo, meaning "a pound by weight," where libra referred to a unit of or . The term "" itself entered English from pund, cognate with other , but the abbreviation retained the Latin root due to medieval scribal practices distinguishing the weight (libra) from the container or . The , the standard unit for most everyday measurements, is defined exactly as 0.45359237 kilograms, established by an agreement in 1959 among English-speaking nations to align customary units with standards. This definition fixes the as a unit of in the customary and systems, employed for applications such as weighing produce, (e.g., 150 lb for an average adult male), or packaged goods, where 1 lb equals 16 ounces. Distinct from the pound-mass (often denoted lbm or simply lb) is the pound-force (lbf), a unit of force equivalent to the gravitational force exerted on one pound-mass at standard gravity (approximately 32.174 ft/s²), requiring explicit differentiation in engineering and physics to avoid conflating mass with weight. Additionally, the troy pound, used historically for precious metals and comprising 12 troy ounces (each troy ounce being about 1.097 avoirdupois ounces), totals 373.24172 grams—lighter than the avoirdupois pound—though the troy pound itself is obsolete, with troy ounces persisting in bullion markets. Despite the metric system's advantages in decimal coherence and scientific precision, the pound endures in the United States due to entrenched cultural familiarity, economic costs of retooling industries (estimated in billions for full conversion), and legislative inertia following failed metrication efforts like the 1975 , which prioritized voluntary adoption over mandates. This persistence reflects practical utility in sectors like retail and construction, where customary units facilitate intuitive scaling without universal conversion, even as metric dominates global trade and research.

Sports

Linebacker

A linebacker (LB) is a defensive position in American football, stationed behind the defensive line of scrimmage, tasked with stopping running plays by filling gaps and tackling ball carriers, covering pass receivers, and occasionally rushing the quarterback to disrupt plays. This role demands a combination of size, speed, and instincts, enabling linebackers to react to offensive movements in real time and apply physical force to alter trajectories of ball carriers or passers, thereby enforcing the game's causal dynamics where superior athletic execution determines outcomes. Effectiveness is quantified through statistics such as tackles (total and solo), sacks (takedowns of the quarterback), interceptions, and forced fumbles, which reflect direct contributions to defensive stops. Linebackers are categorized into subtypes based on alignment and primary duties: the middle or inside linebacker (MLB or ILB), often called the "," focuses on run between the tackles and play diagnosis; outside linebackers (OLB) include the strong-side (), who aligns near the for edge containment and run support, and the weak-side (Will), emphasizing pursuit speed and coverage. In modern schemes, outside linebackers in 3-4 defenses often stand upright for versatility in blitzing, contrasting with the more grounded roles in 4-3 alignments. The position evolved alongside football's professionalization in the 1930s and 1940s, transitioning from rigid formations to more fluid responses as offenses incorporated passing; by the late , it adapted to emphasize athletic versatility amid rule changes favoring aerial attacks. , playing for the from 1981 to 1993, exemplified this shift by redefining outside linebackers as primary pass rushers, amassing 132.5 sacks and forcing offenses to adjust protections, thus highlighting the meritocratic edge of disruptive physicality over protective padding. , with the from 1996 to 2012, anchored middle linebacker play through 2,050 combined tackles and dual Defensive Player of the Year awards in 2000 and 2003, demonstrating sustained impact in run-stopping and leadership that prioritized empirical tackling efficiency. In defensive alignments, linebackers are pivotal: the 4-3 scheme deploys four down linemen and three linebackers for balanced run-pass coverage, while the 3-4 uses three linemen and four linebackers to generate confusion via standing rushers, allowing exploitation of mismatches through speed and power. This flexibility underscores 's strategic depth, where linebackers' ability to impose —measured in yards stopped or pressures created—establishes a of athletic merit, independent of external narratives on safety.

Other sports uses

In cricket, "lb" is the standard abbreviation for a , a run scored when the ball deflects off the batsman's body (excluding the hand) without touching the bat, allowing the non-striker and batsman to complete runs as per the rules of the (). This scoring method, governed by Law 23 of the , credits the run to the batting team but not to the individual batsman, emphasizing causal deflection rather than intentional bat contact. Separately, "LB" denotes a leg break, a delivery imparted by a leg spinner that pitches on the and deviates toward the after bouncing, exploiting the batsman's stance for potential dismissals like or . In (soccer), "LB" commonly abbreviates left back, the defensive position stationed on the left flank of the backline, responsible for marking opposing wingers, supporting midfield transitions, and delivering crosses during attacks in standard 4-4-2 or 4-3-3 formations. This role, integral to tactical setups since the evolution of modern full-back duties in the early , requires versatility in overlapping runs and defensive recovery, as seen in professional leagues like the English where left backs average 1.5 tackles per match based on positional analytics.

Geographical places

United States

Long Beach, California, commonly abbreviated as LB, is a and the 42nd-largest in the by population, recording 466,742 residents in the 2020 Census. Originally settled in the late amid California's post-Gold Rush expansion, it was first incorporated on February 10, 1888, as Willmore City before being renamed and disincorporated due to local disputes over laws; it reincorporated on December 13, 1897, evolving from a modest into a key industrial and trade center. The city's location adjacent to the positioned it as a vital node in westward U.S. , leveraging free-market incentives like minimal regulatory barriers to attract shipping and . The , one of the world's busiest container ports, underscores LB's economic significance, processing 8,018,668 twenty-foot equivalent units (TEUs) in 2023 despite a 12.2% year-over-year decline from pandemic-era peaks, reclaiming its status as the second-busiest U.S. port by volume. This activity generates $309 billion in annual U.S. GDP contributions and sustains 2.7 million jobs nationwide through import-export chains, primarily with partners, with inbound consumer goods comprising the bulk of traffic. Empirical port data refute narratives of infrastructural stagnation, as throughput has stabilized near pre-2020 levels via efficiency gains in and , handling over 90 million metric tons of cargo annually. Long Beach's aerospace legacy further highlights its role in national innovation, hosting Douglas Aircraft facilities from the 1920s that produced military planes during and later the transport until assembly ended in 2015 following Boeing's acquisition of McDonnell Douglas in 1997. These operations employed thousands and advanced U.S. airlift capabilities, tying into broader Cold War-era defense expansion. Smaller U.S. locales occasionally referenced as LB include Long Beach in (population 46,073 in 2020) and Mississippi (population 4,788 in 2020), though lacking the scale or trade prominence of the California counterpart.

International

Lebanon, designated by the code LB, is a sovereign country in the region of Western Asia. It spans 10,452 square kilometers along the coast, with borders shared by to the north and east and to the south. The terrain features coastal plains, the Bekaa Valley, and range, influencing its agriculture-focused economy, including , olives, and production. As of 2023, Lebanon's stood at 5,773,493, reflecting net migration outflows amid economic challenges and regional instability. serves as the capital and principal port, historically a trading hub since Phoenician times. In the , LB abbreviates "London borough," referring to the 32 districts that form the bulk of Greater London's administrative structure, excluding the . These boroughs, created by the London Government Act 1963 and operational from 1 April 1965, manage services such as , , and transport at a local level. Each is geographically defined within the metropolitan area, with populations ranging from about 150,000 in Kensington and Chelsea to over 370,000 in as of mid-2023 estimates. The boroughs' boundaries reflect historical parishes and urban growth patterns, supporting diverse economies from in the City-adjacent areas to in outer zones.

Businesses and organizations

Companies

L.B. Foster Company, founded in 1902 and headquartered in , , manufactures and distributes products for rail , construction, and energy sectors, including steel forgings, trackwork, and pipe supports. The firm has expanded through acquisitions and product diversification, deriving about one-third of its revenues from markets entered within the last decade, reflecting responsiveness to demands rather than reliance on subsidies. In 2024, it generated $530.77 million in revenue, down 2.39% from the prior year, while achieving net earnings of $42.95 million through operational efficiencies. L.B. White Company, established in 1952 in Appleton, Wisconsin, produces forced-air, radiant, and convection heaters powered by propane, natural gas, or kerosene, targeting agricultural, construction, and temporary event applications. It innovated enclosed-flame portable heating to isolate combustion from the environment, improving safety and market adoption in livestock and poultry sectors. Over 65 years, the company built leadership in niche heating via design expertise; it was acquired by private equity firm Mason Wells in 2017 and sold to a new buyer on May 31, 2025, sustaining growth in specialized equipment. LandBridge Company LLC, founded in 2021 and based in , , operates in the Permian Basin, extracting and selling brackish alongside surface materials like for industrial and energy uses. The company capitalized on regional by developing for non-potable supply, listing on the NYSE under ticker LB. Its model leverages land assets for revenue from royalties and direct sales, adapting to oilfield demands without heavy regulatory dependence.

Other organizations

Lutheran Brotherhood (LB) was established on January 12, 1917, in Minneapolis, Minnesota, as a fraternal benefit society primarily serving members of the Norwegian Lutheran Church of America by offering life insurance, financial services, and mutual aid to promote self-reliance within Lutheran communities. The organization operated on a membership model, requiring participants to be practicing Lutherans, and emphasized charitable activities, including support for church missions, education, and community welfare programs aligned with traditional Lutheran values such as family stability and ethical stewardship. By the mid-20th century, LB had expanded to include broader financial products while maintaining its non-profit status and commitment to reinvesting surplus funds into member benefits and Lutheran causes, amassing significant assets—over $2 billion in mutual funds by 1995 alone—through conservative investment strategies focused on long-term security rather than speculative growth. In 2002, Lutheran Brotherhood merged with the Aid Association for Lutherans (AAL) to form Financial for Lutherans, a move driven by regulatory pressures and the need for in a consolidating industry, though the resulting entity retained elements of the original fraternal structure, including volunteer-led chapters for . This merger marked the end of LB as an independent entity but preserved its legacy of fostering associative networks that prioritized empirical and causal links between personal responsibility and communal support, evidenced by decades of low default rates and sustained payouts to policyholders during economic downturns like the . Historical records indicate LB's model succeeded in building trust among immigrant Lutheran populations by avoiding high-risk practices common in secular insurers, thereby contributing to the and resilience of affiliated communities without reliance on government intervention.

Science and technology

Mathematics and computing

In and , lb denotes the , lb(x) = log₂(x), representing the exponent to which 2 must be raised to yield x. This notation facilitates calculations involving powers of two, such as determining the minimum number of bits required to represent a positive n in , calculated as ⌊lb(n)⌋ + 1. For instance, lb(100) ≈ 6.644, requiring 7 bits for representation. The binary logarithm appears in information theory for quantifying uncertainty in binary systems, notably in the binary entropy function H(p) = −p lb(p) − (1−p) lb(1−p), where p is the probability of a binary outcome; this measures entropy in bits, with maximum value 1 at p = 0.5. In computing, LB abbreviates load balancer, a mechanism that allocates incoming network requests across multiple backend servers or resources to optimize resource utilization, minimize response times, and enhance fault tolerance..html) Load balancers employ algorithms like round-robin or least connections to distribute traffic, supporting scalability in web applications and cloud environments. Amazon Web Services introduced Elastic Load Balancing (ELB) in May 2009 as an early scalable implementation, enabling automatic traffic distribution across Amazon EC2 instances while providing health checks and failover capabilities.

Other scientific and technical uses

Langmuir-Blodgett (LB) films consist of one or more of amphiphilic molecules deposited from the surface of a subphase, typically , onto a solid substrate via controlled vertical or horizontal dipping. This technique enables the fabrication of ultrathin nanostructured films with precise control over layer thickness, often at the molecular scale, achieving thicknesses as low as 2-3 nm per . The method originated from Irving Langmuir's investigations into monolayers of fatty acids on water surfaces in the early 1920s, building on observations of oil spreading to calm water ripples dating back to ancient times. Blodgett advanced the process in 1935 by developing a means to transfer multiple ordered monolayers onto glass slides using a movable barrier to compress the , earning a for the LB trough apparatus. The LB trough itself features a shallow for the subphase, barriers to regulate (measured in millinewtons per meter), and a dipping mechanism for , allowing isotherms to characterize film behavior under compression. In , LB films facilitate the assembly of two-dimensional heterostructures from materials like nanoparticles or polymers, with applications in biosensors where monolayers detect analytes via changes in surface properties. For instance, LB-deposited films of arachidate exhibit optical interference effects, enabling precise thickness measurements, while recent adaptations integrate nanocrystals for optoelectronic devices. These films' ordered molecular packing supports supramolecular architectures resistant to defects, though stability can vary with environmental factors like . Transition from legacy empirical notations to units in related measurements underscores the technique's alignment with modern scientific standards, avoiding ambiguities in pre-metric systems.

Other uses

People

Ludwig Boltzmann (February 20, 1844 – September 5, 1906) was an physicist renowned for advancing , formulating the describing particle distribution in gases, and defining the relating energy to temperature in thermodynamic systems. Louis Braille (January 4, 1809 – January 6, 1852) was a educator who, blinded as a child, developed the system—a tactile code using raised dots for reading and writing by the visually impaired—initially devised in 1824 and refined by 1837 for widespread use. Louis B. Mayer (July 12, 1884 – October 29, 1957) was a Canadian-American film executive who co-founded (MGM) studios on April 17, 1924, overseeing production of over 1,000 films and implementing the studio's that dominated Hollywood's .

Miscellaneous

In naval terminology during , LB designated "landing barge," a type of unpowered or minimally powered vessel requisitioned or converted from civilian dumb barges, primarily by British forces, to support amphibious assaults such as the in 1944. These barges, including variants like LB (dumb), LBF (fitted for fuel), and LBW (water), were towed into position to offload troops, vehicles, or supplies directly onto beaches, with over 500 units numbered and deployed despite high vulnerability to enemy fire due to their lack of propulsion and armor. In aviation history, LB or L/B abbreviated "," describing relatively small, maneuverable designed for short-range missions before the , when larger strategic bombers dominated. Examples include the U.S. Keystone LB-6, a produced in the late with a crew of five and capacity up to 2,000 pounds, valued for its speed and low-altitude utility in early air forces but rendered obsolete by advancements in and multi-role fighters. In contemporary informal online communication, particularly on platforms like , LB serves as for "like back," a request where a asks another to like their post in exchange for a like, reflecting of mutual rather than genuine endorsement. This usage emerged in the mid-2010s amid growth in influencer culture but lacks empirical tracking in formal linguistic corpora, appearing primarily in anecdotal reports from digital etiquette guides.

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