HTML Mathematical Operators and Relations

In order to create a symbol that is not already on your keyboard, your must use a code. The codes for the following symbols are listed under the Number Code and Letter Code columns of the chart below. Either code will work.

To add them to a post, simply go to New Post, make sure the post is in Edit Html mode, and copy and paste one of the corresponding codes that I have provided. Then Publish Post.

Symbol	Number Code	Letter Code	Explanation of Symbol
∀	∀	∀	for all
∂	∂	∂	partial differential
∃	∃	∃	there exists
∅	∅	∅	empty set, null set, diameter
∇	∇	∇	nabla, backward difference
∈	∈	∈	element of
∉	∉	∉	not an element of
∋	∋	∋	contains as member
∏	∏	∏	n-ary product, product sign
∑	∑	∑	n-ary sumation
−	−	−	minus sign
∗	∗	∗	asterisk operator
√	√	√	square root, radical sign
∝	∝	∝	proportional to
∞	∞	∞	infinity
∠	∠	∠	angle
∧	∧	∧	logical and, wedge
∨	∨	∨	logical or, vee
∩	∩	∩	intersection, cap
∪	∪	∪	union, cup
∫	∫	∫	integral
∴	∴	∴	therefore
∼	∼	∼	tilde operator, varies with, similar to
≅	≅	≅	approximately equal to
≈	≈	≈	almost equal to, asymptotic to
≠	≠	≠	not equal to
≡	≡	≡	identical to
≤	≤	≤	less-than or equal to
≥	≥	≥	greater-than or equal to
⊂	⊂	⊂	subset of
⊃	⊃	⊃	superset of
⊄	⊄	⊄	not a subset of
⊆	⊆	⊆	subset of or equal to
⊇	⊇	⊇	superset of or equal to
⊕	⊕	⊕	circled plus, direct sum
⊗	⊗	⊗	circled times, vector product
⊥	⊥	⊥	up tack, orthogonal to, perpendicular
⋅	⋅	⋅	dot operator