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• the geometric unit square;
• the square units of measurement, such as the square mile, square meter, square kilometer, square inch , and square megameter;
• the square waveform.

But a square is also several other things, conceptually or etymologically derived from the shape:

• an algebraic square,
  • and the closely related square number
  • and perfect square;
• a city square;
• the town of Central Square, New York;
• the carpentry squareIn carpentry, a square is a guide for establishing right angles (ninety-degree angles), usually made of metal and in the shape of a right triangle., combination squareA combination square is a woodworking tool used for multiple purposes. The Square refers to the primary use of the tool: measuring the accuracy of a right angle (90°). The tool is composed of primarily two parts: a rule and a head. Uses Measuring angles — and try squareA try square is a woodworking tool used for marking and measuring a piece of wood. The Square refers to the primary use of the tool: measuring the accuracy of a right angle ( 90 degrees). A piece of wood that is rectangular, flat, and has all edges (faces;
• the draftingThis is about drafting, the art and science of technical drawing. For other uses, see Drafting (disambiguation Drafting or draughting also known as technical drawing is the technique of creating engineering drawings. Skilled practitioners of the art are k toolThis page discusses common devices known as "tools". For the band, see Tool (band). For other meanings, see Tool (disambiguation). A tool is, among other things, a device that provides a mechanical or mental advantage in accomplishing a task. Most tools e called the T-squareA T-square is primarily a guide for drawing horizontal lines on a drafting table. It is also used to guide the triangle that draws vertical lines. Its name comes from the general shape of the instrument where the horizontal member of the T slides on the s;
• A Square, the main narrator of the geometry story Flatland;
• on the subject of video gamescreenshot of Tetris for the Nintendo Game BoyA video game is a game played using an electronic device with a visual display. Overview Often "video game" is taken in a narrow sense to mean those games played on consoles for television and similar handhelds, Square is short for Squaresoft;
• square as a slang noun or adjective;
• the Square cryptographic block cipher;
• the various square dances;
• the Mandarin square insignia;
• the hawk species the Square-tailed Kite ;
• the sailing term, square-rigging .