Where does “T定規” come from?

T定規 (Japanese) comes from Japanese 定規 — straightedge instrument for drawing lines.

T定規 (Japanese): a T-square

Definitions

  1. a T-square

Ancestry of “T定規”, step by step

T定規 traces back through two separate lines of ancestry.

via Japanese 定規

StepLanguageWordMeaning
1Japanese定規straightedge instrument for drawing lines

via Japanese T

StepLanguageWordMeaning
1JapaneseT
Every word from Japanese 定規