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T-square, tee square
A guide used in mechanical and architectural drawing; consists of two arms joined together at right angles, like the letter T; the shorter arm slides along the edge of the drawing table or drawing board, which serves as a guide; the longer arm is used to draw parallel lines or to support triangles for drawing lines at different angles.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.