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try square[′trī ‚skwer]
An instrument consisting of two straightedges secured at right angles to each other, used for laying off right angles and testing whether work is square.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
square whose legs are fixed at 90°; serves as a guide for marking lines at right angles to an edge or surface, as a scale for laying out work, and as a tool for testing the straightness and/or squareness of edges, faces, etc.A
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.