By A Mystery Man Writer
Fun with Numbers: Where do the + Plus and - Minus Signs come from?
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Creative Technique, PDF, William Blake
Plus and minus signs - Wikipedia
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Plus And Minus Signs Plus-minus Sign PNG, Clipart, Angle, Austrian, Button, Computer Icons, Download Free PNG Download
What's the name for 'plus or minus' (±)? - Quora
Creative Technique, PDF, William Blake