Translation guide
A T-square is a technical drawing tool used for drawing horizontal lines and as a guide for triangles. In Japanese, it is referred to by specific terms depending on context, but the most common is a direct loanword.
The physical T-shaped ruler used in drafting and technical drawing.
The standard Japanese term for a T-square. Literally 'T-ruler'.
You need a T-square for drafting.
In the old drafting room, there are still T-squares.