Greek Characters
symbolnamekeyboard
Α, α Alpha ALT-224
B, β Beta ALT-225
Γ, γ Gamma ALT-226
Δ, δ Delta ALT-235,916 ⌥ j
Ε, ε Epsilon ALT-238
Θ, θ Theta ALT-952
Λ, λ Lambda ALT-995
Μ, μ Mu ALT-230, ⌥ m
Π, π Pi ALT-227, ⌥ p
Σ, σ, ς Sigma ALT-228,229, ⌥ w
Φ, φ Phi ALT 232, 237
Χ, χ Chi ALT 967, 935
Ω, ω ς Omega ALT-234, ⌥ z

Numbers Sets
symbolnamekeyboard
∈, ∊, ∉ Element belongs to, doesn't belong to
Natural Numbers
𝕀 Pure Imaginary
Integers, from German, "Zahlen"
Rationals. from Italian "Quoziente"
Irrational numbers (also ℝ∖ℚ is used)
Reals
Complex numbers

Subscript & Superscript
symbolnamekeyboard
⁰  ₀ super, subscript 0
¹   ₁ Super, subscript 1 ALT-0185
²  ₂ Super, subscript 2 ALT-253
³  ₃ Super, subscript 3 ALT-0179
₄ ⁴ Super, subscript 4
₅ ⁵ Super, subscript 5
₆ ⁶ Super, subscript 6
₇ ⁷ Super, subscript 7
₈ ⁸ Super, subscript 8
₉ ⁹ Super, subscript 9
ⁱ ₑ ⁿ i, e, n n, ALT-252
Operators & Relations
symbolnamekeyboard
square root ALT-251, ⌥ v
∛  ∜ cube root & quad root
÷ obelus (ah-bel-us), 6÷2=3 ALT-246, ⌥ /
× product, multiplication, times, 5×4=20  
𝑥 italics x
𝒾 italics i, imaginary number
function composition, as in f∘g
Integral for calculus ⌥ b
approximate, as in π ≈ 3.14 ⌥ x
not equal to, as in 1+1≠3 ⌥ =
modular arithmetic congruence
geometry congruence
± plus or minus ALT-241, ⌥ +
multiplication dot or bullet ALT-0149, ⌥ 8
long division operator
greater than or equal to ALT-242, ⌥ >
less than or equal to ALT-243, ⌥ <

Fractions
symbolnamekeyboard
½ one half ALT-0189
one third
¼ one fourth
¾ three fourths ALT-0188

Statistics Symbols
symbolnamekeyboard
x-bar sample mean ALT-0189
p-hat proportion of a sample
ŷ y-hat predicted outcome
μ Mu, mean of a population ALT-230, ⌥ m
σ Sigma, population standard deviation ALT-229, ⌥ w

Miscellaneous Symbols
symbolnamekeyboard
¢ American money unit cent ALT-0189
right pointing arrow
basic check mark ✓good job!
Infinity symbol, Lemniscate,
pronounced (lem-nis-kit)
ALT-236, ⌥ 5
ƒ italics f for functions ⌥ f
Apple Computer Logo ⌥ K

Trigonometry & Angles
symbolnamekeyboard
sin⁻¹ Inverse Sine
cos⁻¹ Inverse Cosine
tan⁻¹ Inverse Tangent
° degree ALT-248, ⌥⇧8
∠, ⦜ angle & right angle
△, ⊿ triangle, right-triangle ⌥ j