Symbol 
Description 
Alt Code 
macOS keys 
ℤ 
Set of integer numbers symbol, from German "Zahlen" 


ℚ 
Set of rational numbers symbol 


∴ 
therefore symbol 


✓ 
check mark 


∜ 
fourth root 


∛ 
cube root 


→ 
geometry "Then" arrow or transform arrow 


▱ 
geometry parallelogram 


△ 
geometry triangle 


≥ 
greater than or equal to 
ALT242 
option < 
≤ 
less than or equal to 
ALT243 
option > 
x̄ 
xbar average or mean 


p̂ 
phat proportion of a sample 


ŷ 
yhat predicted outcome 


Δ 
Greek uppercase delta, change 


Ω 
Greek uppercase omega 
ALT234 
option z 
θ 
Greek lowercase Theta 


μ 
Greek lowercase mu, stat mean, or micro 
ALT230 
option m 
σ 
small sigma, standard deviation 
ALT229 

χ 
Greek lowercase chi, pronounced as "key" 


π 
Greek lower case pi 
ALT227 
option p 
₁ 
subscripted 1 


₂ 
subscripted 2 


² 
squared, superscripted 2 
ALT0178 

³ 
cubed, superscripted 3 
ALT0179 

√ 
radical or square root 
ALT8730 

½ 
onehalf, half symbol 
ALT0189 

¼ 
onequarter or onefourth symbol 
ALT0188 

± 
combined plusorminus 
ALT0177 
option shift + 
∙ 
multiplication dot, bullet symbol 
ALT0149 
option 8 
∞ 
Lemniscate, (pronounced lemniskit) 
ALT236 
option 5 
∠ 
angle symbol 


° 
degree symbol 
ALT248, 0176 
option 0 
≅ 
congruence symbol 


÷ 
obelus, or division symbol 
ALT246 
option / 
¢ 
cent, american money unit 
ALT0162 
option 4 
ø 
empty set 

option shift o 
∘ 
function composition, (f∘g) 


≈ 
approximately equal to 


≠ 
not equal to 

option = 