ASCII / HTML / Unicode

The following is a list of special characters and symbols in ASCII together with their HTML name and number, the unicode number and the description of the characters.

Mathematical Notation
ASCIISymbolHTML NameHTML NumberUnicodeDescription
8704∀∀∀\2200For all
8706∂∂∂\2202Partial differential
8707∃∃∃\2203There exists
8709∅∅∅\2205Empty set, null set, diameter
8711∇∇∇\2207Nabla, backward difference
8712∈∈∈\2208Element of
8713∉∉∉\2209Not an element of
8715∋∋∋\220BContains as member
8719∏∏∏\220Fn-ary product
8721∑∑∑\2211n-ary sumation
8722−−−\2212Minus sign
8727∗∗∗\2217Asterisk operator
8730√√√\221ASquare root
8733∝∝∝\221DProportional to
8734∞∞∞\221EInfinity
8736∠∠∠\2220Angle
8869∧∧⊥\2227Logical AND, or wedge
8870∨∨⊦\2228Logical OR, or vee
8745∩∩∩\2229Intersection, or cap
8746∪∪∪\222AUnion, or cup
8747∫∫∫\222BIntegral
8756∴∴∴\2234Therefore
8764∼∼∼\223CTilde operator, or varies with
8773≅≅≅\2245Approximately equal to
8776≈≈≈\2248Almost equal to, asymptotic to
8800≠≠≠\2260Not equal to
8801≡≡≡\2261Identical to
8804≤≤≤\2264Less-than or equal to
8805≥≥≥\2265Greater-than or equal to
8834⊂⊂⊂\2282Subset of
8835⊃⊃⊃\2283Superset of
8836⊄⊄⊄\2284Not a subset of
8838⊆⊆⊆2286Subset of or equal to
8839⊇⊇⊇\2287Superset of or equal to
8853⊕⊕⊕\2295Circled plus, direct sum
8855⊗⊗⊗\2297Circled times, vector product
8869⊥⊥⊥\22A5Up tack, orthogonal to, perpendicular
8901⋅⋅⋅\22C5Dot operator
9642▪▪\25AABlack small square
9675○○\25CBWhite circle
9673◉◉\25C9/td>Fisheye
9678◎◎\25CEBullseye
8723∓∓\2213Minus-or-plus sign
8724∔∔\2214Dot plus
8725∕∕\2215Division slash
8726∖∖\2216Set minus
8727∗∗\2217Asterisk operator
8968⌈⌈⌈\2308Left ceiling, a.k.a. apl upstile
8969⌉⌉⌉\2309Right ceiling
8970⌊⌊⌊\230ALeft floor, apl downstile
8971⌋⌋⌋\230BRight floor
9674◊◊◊\25CALozenge