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#39;angle (right),right angle' symbol, part of the Blissymbolics symbolset. Find thousands of free symbols for communication.
Blissymbols The Daily Omnivore
Research on the ISOTYPE method. Isotypically. See How to Say It. Contains volume 1 and volume 2. by isotypically - Issuu
angle (right),right angle in Blissymbolics · Global Symbols
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File:Blissymbolics.svg - Wikipedia
Journal of Universal Language
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Bliss Rules, PDF, Writing
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Symbols for angles
W3C Alternative and Augmented Communication (AAC) Symbol Registry
iceberg in Blissymbolics · Global Symbols