Armlen

Armlen is not a formal dictionary entry in itself; it is commonly used as a shorthand for arm length or as a variable name in data, software, or technical documentation to denote the length of an arm. In practice, armlen refers to the measurement used to indicate how long a person’s arm is, typically in contexts such as ergonomics, apparel sizing, or digital modeling.

In anthropometry, arm length is usually defined as the distance from the acromion, the bony point at the shoulder, to the tip of the middle finger when the arm is extended. Measurement methods vary: direct measurement with a tape or calipers, or using standardized anthropometric instruments. Related metrics include arm reach (the maximal distance the hand can reach with the arm extended) and arm span (the distance between fingertip to fingertip with arms outstretched), which are distinct but connected dimensions.

Applications of armlen include garment design and sizing, ergonomic planning for workplaces and tools, sports science and rehabilitation assessments, and avatar or character modeling in animation and video games. In robotics and computer graphics, armlen may denote the length parameter of a simulated or physical arm, influencing reach, dexterity, and kinematic calculations. Because arm length varies with height, sex, age, and population, it is typically considered alongside other body measurements when designing equipment, interfaces, or simulations.