# set square

> English word · Noun

## Definitions
1. A flat triangular piece of plastic or other material, having corners of precise angles, used in technical drawing
2. A right angle tool used to determine if two surfaces join at a 90-degree angle, composed of two arms, usually made from metal.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/set-square