Page:The practice of typography; correct composition; a treatise on spelling, abbreviations, the compounding and division of words, the proper use of figures and nummerals by De Vinne, Theodore Low, 1828-1914.djvu/60

 MATHEMATICAL SIGNS + plus - minus × multiplied by ± or ∓ plus or minus ÷ divided by = equal to > greater than < less than ∫ difference between ∝ proportioned to ∞ indefinitely more 0 indefinitely less ∠ angle ∟ right angle ⊥ perpendicular ∥ parallel ≚ equiangular ○ full circle or 360° ◠ arc of circle ▭ rectangle △ triangle □ square ∶ and ∷ signs of geometrical proportion, as in A∶B∷C∶D ܅ minus, the sign of mathematical proportion ∷ equal to, in arithmetical proportion ∴ therefore ∵ because √ root or radical ̅ vinculum ∆ finite difference ° degree of circle ′ minute of circle ″ second of circle
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