Symbols You Might Find Useful

October 23, 2013HTML5Dave

If you find need to enter some math equations, logical statements or simply useful symbols, you may find the following symbols helpful.

Frequently Used Symbols
bullet • •	square ☐ ☐	diamond ♦ &diams;	triangle ‣ ‣
checkmark ✓ ✓	checkmark ✔ ✔	ballet X ✗ ✗	ballet X ✘ ✘
box ☐ ☐	marked box ☑ ☑
copyright © ©	trademark ™ ™	Registered ® ®	Pi π π
cents ¢ ¢	pound equal £ £	euro € €

Arrows
left arrow ← ←	right arrow → →	up arrow ↑ ↑	down arrow ↓ ↓
double left ⇐ ⇐	double right ⇒ ⇒	double up ⇑ &uArr;	double down ⇓ &dArr;
left right ↔ ↔	double left right ⇔ ⇔	up down ↕ &varr;

Relationships
equal =	not equal ≠	almost equal ≈ &symp;	proportional to ∝ &prop;
less than <	greater than >	less than or equal ≤	greater than or equal ≥
congruent ≅ &cong;	approximately equal ≅ &cong;	similar ∼ &sim;	is identical to ≡ ≡

Generic Symbols
add +	subtract –	multiply × ×	divide ÷ ÷
square root √ √	plus or minus ± ±	factorial !	negative –
degree ° °	and so on ⋯ ⋯	grouping symbols ()	infinity ∞ ∞

Symbols for Geometry
angle ∠ ∠	measure of angle m∠ m∠	parallel ∥ ∥	perpendicular ⊥ &perp;
not parallel ∦ ∦	right angle ∟ ∟	congruent to ≅ &cong;

Symbols for Sets
is a subset of ⊂ ⊂	is not a subset of ⊄ &nsub;	is a subset of or equal ⊆ &sube;	intersection ∩ ∩
superset of ⊃ ⊃	not a superset of ⊅ ⊅	is a superset of or equal ⊇ &supe;	union ∪ ∪

Symbols for Logic
for all ∀ ∀	there exists ∃ ∃	there does not exist ∄ ∄	element of ∈ ∈
not and element of ∉ ∉	such that \|	and ∧ &and;	or ∨ &or;
Not (tilde) ˜ &tilde;	therefore ∴ &there4;

Symbols for Calculus
integral ∫ ∫	derivative d	delta ∆ ∆
contour Integral ∮ ∮	partial differential ∂ ∂	gradient ∇ ∇	epsilon ϵ ϵ

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