The right angle symbol is used to denote a right angle.
What Types of Angles There Are / 5-Minute Crafts
A report on the origin of the mysterious symbol '⍼' contained in Unicode is now available - GIGAZINE
Right angle - Wikipedia
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Right Angle - Definition, Shape, Examples and Properties
RIGHT-POINTING CURVED ANGLE BRACKET
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angle (right),right angle in Blissymbolics · Global Symbols
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∠ angle (U+2220) @ Graphemica