The Y doesn't stand for anything. It is part of the word RAY. In fact, the X doesn't stand for anything either. They were called x-rays because the type of radiation was unknown at the time.
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X-ray
Slope-Intercept Form is y=mx+b. m=slope and b=y-intercept. The y and x stand for the x and y coordinates in an ordered pair (x,y).
Variables are letters that stand for numbers x=5 y=3 j=4 J+X = 9
X and Y do not stand for anything. They are merely letters that represent a variable in an algebraic equation. X is generally used as the first variable, and Y is used as the second variable, to differentiate the difference between two variables so one letter does not need to be used for two variables. In GRAPHS, they stand for the axis line. X is the horizontal axis, and Y is the vertical axis.
It means the Y and X intercept for a graphing equations if that's what your asking