Right Angle
A right angle is the meeting of two lines in an angle of ninety degrees, or the fourth part of a circle. Each of its lines is perpendicular to the other; and as the perpendicular line is a symbol of uprightness of conduct, the right angle has been adopted by Freemasons as an emblem of virtue. Such was its signification among the Pythagoreans. The right angle is represented in the Lodges by the square, as the horizontal is by the level, and the perpendicular by the plumb.
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This page is adapted from the Glossary at Phoenixmasonry — Used with permission.