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Usage in mathematics and computer programming. In mathematics, the equal sign can be used as a simple statement of fact in a specific case (" x = 2 "), or to create definitions (" let x = 2 "), conditional statements (" if x = 2, then ... "), or to express a universal equivalence (" (x + 1)2 = x2 + 2x + 1 ").
Double tilde: Approximation [≈] or Double negation [ ~ (~ ] This page uses orthographic and related notations. For the notations , / / and [ ] used in this article, see IPA Brackets and transcription delimiters. The tilde ( / ˈtɪld, - di, - də, - deɪ /) [1] ˜ or ~, is a grapheme with a number of uses.
A ⊂ B {\displaystyle A\subset B} may mean that A is a proper subset of B, that is the two sets are different, and every element of A belongs to B; in formula, A ≠ B ∧ ∀ x , x ∈ A ⇒ x ∈ B {\displaystyle A eq B\land \forall {}x,\,x\in A\Rightarrow x\in B} . ⊆. A ⊆ B {\displaystyle A\subseteq B}
U+2252 ≒ APPROXIMATELY EQUAL TO OR THE IMAGE OF: which is used like "≈" or "≃" in Japan, Taiwan, and Korea: U+2253 ≓ IMAGE OF OR APPROXIMATELY EQUAL TO: a reversed variation of U+2252 ≒ APPROXIMATELY EQUAL TO OR THE IMAGE OF: U+225F ≟ QUESTIONED EQUAL TO: U+2A85 ⪅ LESS-THAN OR APPROXIMATE: U+2A86 ⪆ GREATER-THAN OR APPROXIMATE
Probability density functions (pdfs) and probability mass functions are denoted by lowercase letters, e.g. , or . Cumulative distribution functions (cdfs) are denoted by uppercase letters, e.g. , or . In particular, the pdf of the standard normal distribution is denoted by , and its cdf by .
The symbol is variously referred to as "partial", "curly d", "funky d", "rounded d", "curved d", "dabba", "number 6 mirrored", [6] or "Jacobi's delta", [5] or as "del" [7] (but this name is also used for the "nabla" symbol ∇ ). It may also be pronounced simply "dee", [8] "partial dee", [9] [10] "doh", [11] [12] or "die".
In the Unicode standard, the symbol £ is called POUND SIGN, and the symbol ₤ is the LIRA SIGN. These have respective code points: U+00A3 £ POUND SIGN (£ · inherited from Latin-1) U+20A4 ₤ LIRA SIGN; Unicode notes that the "lira sign" is not widely used and was added due to both it and the pound sign being available on HP printers.
In astronomy , it stands for the fifth-brightest star in a constellation (see Bayer designation ). Epsilon is the name for the most distant and most visible ring of Uranus. In planetary science, ε denotes the axial tilt. In chemistry, it represents the molar extinction coefficient of a chromophore.
integral sign. : colon (for division ) 1684 (deriving from use of colon to denote fractions, dating back to 1633) ·. middle dot (for multiplication ) 1698 (perhaps deriving from a much earlier use of middle dot to separate juxtaposed numbers) ⁄. division slash (a.k.a. solidus )
Without proper rendering support, you may see question marks, boxes, or other symbols. The triple bar or tribar, ≡, is a symbol with multiple, context-dependent meanings indicating equivalence of two different things. Its main uses are in mathematics and logic.