Scale
Scale or scales may refer to:

Mathematics
Scale (descriptive set theory), an object defined on a set of points
Scale (ratio), the ratio of a linear dimension of a model to the corresponding dimension of the original
Scale factor, a number which scales, or multiplies, some quantity
Long and short scales, how powers of ten are named and grouped in large numbers
Scale parameter, a description of the spread or dispersion of a probability distribution
Feature scaling, a method used to normalize the range of independent variables or features of data
Scale (analytical tool)

Measurements
Scale (map), the ratio of the distance on a map to the corresponding actual distance
Scale (geography)
Weighing scale, an instrument used to measure mass
Scale (ratio), the ratio of the linear dimension of the model to the same dimension of the original
Spatial scale, a classification of sizes
Scale ruler,  a tool for measuring lengths and transferring measurements at a fixed ratio of length
Vernier scale, the scale on calipers

Music
Scale (music), a sequence of ordered musical notes
Scale (string instruments), the sounding length of the strings of an instrument
Scale (album), a 2006 album by electronic artist Matthew Herbert
"The Scale", a song from Our Love to Admire by Interpol
Musicians scale, the pay scale set by unions of musicians

Science
Biology
Scale (anatomy), a rigid plate which grows out of the skin of various animals
Scale (dermatology), a secondary skin lesion in humans that resembles animal scales
Scale (insect anatomy), a feature of the wings of moths and butterflies
Scale, a type of trichome, any flat epidermal outgrowth in botany
Bulb scale, the storage layers of a plant bulb
Scale insect, a waxy coated animal that resembles a fish scale

Chemistry and materials science
Fouling, sometimes called scale, a buildup of unwanted substances on a submerged surface
Limescale, a hard, chalky deposit that often builds up inside kettles, hot water boilers, and pipework
Mill scale, the flaky surface on hot rolled steel, consisting of iron oxides
Scale (chemistry), the range of mass or volume of a chemical reaction or process

Other sciences
Scale (analytical tool), a concept in the study of complex systems and hierarchy theory
Scale (social sciences), a tool for ordering entities by quantitative attributes

Places
Scales, California, a community in the United States
Scales, Lancashire, part of the village of Newton-with-Scales
Scales, near Kirkoswald, Cumbria, a hamlet
Scales, South Lakeland, Cumbria, England, a village
The Scales, the initial climb of the Chilkoot Pass

Other uses
Scales (surname)
Scales (film), a 2019 Saudi Arabian film
Baron Scales, a title in the Peerage of England
Libra (constellation), also known as "the scales", or the namesake astrological sign
Mizan (Scale in English), a treatise on Islam by Javed Ahmed Ghamidi
Pay scale, a system or structure of compensation for work
Scale armour, an early form of armor
Southern California Linux Expo, an open-source software conference held in Los Angeles, California

See also
Scala (disambiguation)
Scalability, a concept in business, computer science, and electronics
Scali (disambiguation)
Scaling (disambiguation)