In mathematics, a stands for letters and can be used instead of numbers. |a| represents the absolute value of a in mathematics. If a and 1 are antonyms, then a=- 1, |- 1|= 1. Absolute value is the distance from a point corresponding to a number on the exponential axis to the origin, which is represented by "||". |b-a| or |a-b| represents the distance between the point representing a and the point representing b on the number axis. \ r \ For detailed information about what A stands for in mathematics, please visit:/ask/eb8ae01615833362.html? Zd view more content