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2017-04-02T18:31:38+10:00
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Meaning
Symbol
angle
∠
approximately equal
≈
congruent
≡
delta
Δ
discriminant
Δ
factorial
!
infintity
∞
mu
µ
not equal
≠
parallel
║
perpendicular
⊥
plus minus
±
sigma (sum)
∑
square root
√
therefore
∴
triangle
Δ
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D
E
F
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