noun
Y; y
The letter Y itself, used as a symbol, variable, or abbreviation.
数学では、Yはよく変数として使われる。
In mathematics, Y is often used as a variable.
noun
Printing term; abbreviation for yellow in CMYK color model.
印刷では、Yはイエローを表す。
In printing, Y stands for yellow.
noun
short grain (paper)
Abbreviation of 横目 (yokome); used in paper industry to indicate grain direction.
See also: 横目
この紙はY目なので、折り曲げに注意が必要だ。
This paper is short grain, so you need to be careful when folding it.