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• T square
  T square

  noun

  a T -shaped ruler, used primarily in mechanical drawing, having a short crosspiece that slides along the edge of the drawing board as a guide to the perpendicular longer section in making parallel lines, right angles, etc., and as a support for triangles.
• T-square
  T-square

  noun

  a T-shaped ruler used in mechanical drawing, consisting of a short crosspiece, which slides along the edge of the drawing board, and a long horizontal piece: used for drawing horizontal lines and to support set squares when drawing vertical and inclined lines

T square

American  

noun

1. a T -shaped ruler, used primarily in mechanical drawing, having a short crosspiece that slides along the edge of the drawing board as a guide to the perpendicular longer section in making parallel lines, right angles, etc., and as a support for triangles.

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T-square British  

noun

1. a T-shaped ruler used in mechanical drawing, consisting of a short crosspiece, which slides along the edge of the drawing board, and a long horizontal piece: used for drawing horizontal lines and to support set squares when drawing vertical and inclined lines

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Etymology

Origin of T square

First recorded in 1775–85

Example Sentences

At war's beginning, Puleston laid aside his brushes and went back to the drawing board with a T square.

From Time Magazine Archive

And out on the Margaritaville scene, the military was the only presence with the posture of a T square.

From Time Magazine Archive

We’ll each make a flying craft/object/thing out of clay, and then we’ll have a contest to see whose flings the farthest across the room off of a big metal T square mounted to his desk.

From "Popcorn" by Rob Harrell

He laid down the T square and the hammer for a piece of pastel crayon.

From Stories from Everybody's Magazine by Various

A T square, with a blade 24 inches long attached permanently to the stock, but not sunk into it.

From An Introduction to Machine Drawing and Design by Low, David Allan