## Have you Learnt the Algebraic Symbols?

Symbol

Symbol Name

Meaning / definition

Example

x

x variable

unknown value to find

when 2x = 4, then x = 2

≡

equivalence

identical to

≜

equal by definition

equal by definition

:=

equal by definition

equal by definition

~

approximately equal

weak approximation

11 ~ 10

≈

approximately equal

approximation

sin(0.01) ≈ 0.01

∝

proportional to

proportional to

y ∝ x when y = kx, k constant

∞

lemniscate

infinity symbol

≪

much less than

much less than

1 ≪ 1000000

≫

much greater than

much greater than

1000000 ≫ 1

( )

parentheses

calculate expression inside first

2 * (3+5) = 16

brackets

calculate expression inside […]