The story
From its shape, resembling a capital letter T.
Etymology from Wiktionary, CC BY-SA 4.0.
T-square
Today it means: A rule with a short perpendicular crosspiece at one end, used by draughtsmen to draw parallel lines. Full definition →
Today it means: A rule with a short perpendicular crosspiece at one end, used by draughtsmen to draw parallel lines. Full definition →
From its shape, resembling a capital letter T.
Etymology from Wiktionary, CC BY-SA 4.0.