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Commonly Used Notations

Symbol Name / Operation Example
∑ summation
√ square root
∠ angle  for example: ∠ABC
≈ approximately equal for example: 3.4 ≈ 3
≠ inequality
≡ definition
≤ less than or equal to
≥ greater than or equal to
⊥ perpendicular for example: x⊥y
• multiplication, dot product
X multiplication
÷ division 3÷2 = 1.5
⁄ division 3/2 = 1.5
|...| absolute value for example |-2| = 2
^ exponentiation 3^2 = 9 and is the same as 32
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