** Near-open front unrounded vowel, the vowel sound represented by the æ symbol

** Chinese character, a written language symbol ( sinogram ) used in Chinese, Japanese, and other languages

** ( n / p ), the Legendre symbol, considered as a function of n where p is a fixed prime number.

** Most 68000 assemblers used the "$" symbol for hexadecimal, instead of " 0x " or a trailing H.

** Occidental Petroleum, an oil company which uses the nickname " Oxy " in its logo, originally from its stock's ticker symbol

** For ohm – SI unit of electrical resistance ; formerly also used upside down () to represent mho, the old name for the inverse of an ohm ( now siemens with symbol S ) used for electrical conductance.

** In statistics, it is used as the symbol for the sample space, or total set of possible outcomes.

** The symbol of the resistance movement against the Vietnam-era draft

** STOP, used to replace the symbol in telegraphs, as Morse code has no method to produce it.

** The Bass Brewery Red Triangle becomes the world's first registered trademark symbol.

** Eureka Flag, a symbol of the Eureka Stockade

** Ticker symbol for ProShares Ultra Russell2000 at NYSE Arca

** Photographic magnitude, the brightness of a celestial object corrected for photographic sensitivity, symbol m < sub > pg </ sub >

** In Hittite ( and Hurrian ) mythology, a triple thunderbolt was one symbol of Teshub ( Tarhunt ).

** Fasces, ancient symbol of an axe bound in a bundle of rods

** Ninth Day of the Ninth Moon ; this was a three-day holiday associated with the promotion of longevity ( with chrysanthemum as the main symbol ).

** In the TNM staging system of cancer, the symbol to show that size or direct extent of the primary tumour was not assessed

** ∂, the partial derivative symbol, often read as " partial "

** Service mark symbol, designated ℠

** σ ( D ) is the symbol of D

** The @ symbol is generated by a combination of Alt Gr + é same key as the 2 ;

** Unlike the French layout, the ' ( or 4 ) key does not contain a third symbol ;

** Unlike the French layout, the ( ( or 5 ) key does not contain a third symbol ;

** The ^ symbol is generated by a combination of Alt Gr + § same key as the 6 ; but, as opposed to the ^ symbol found to the right of the p key, it is not a dead key, and therefore does not generate the placing of a circumflex accent ;

** Eunectes murinus, the green anaconda, the largest species, is found east of the Andes in Colombia, Venezuela, the Guianas, Ecuador, Peru, Bolivia, Brazil and on the island of Trinidad.

** Eunectes notaeus, the yellow anaconda, a smaller species, is found in eastern Bolivia, southern Brazil, Paraguay and northeastern Argentina.

** Eunectes deschauenseei, the dark-spotted anaconda, is a rare species found in northeastern Brazil and coastal French Guiana.

** Eunectes beniensis, the Bolivian anaconda, the most recently defined species, is found in the Departments of Beni and Pando in Bolivia.

** Tarski's theorem: For every infinite set A, there is a bijective map between the sets A and A × A.

** The Cartesian product of any family of nonempty sets is nonempty.

** König's theorem: Colloquially, the sum of a sequence of cardinals is strictly less than the product of a sequence of larger cardinals.

** Hausdorff maximal principle: In any partially ordered set, every totally ordered subset is contained in a maximal totally ordered subset.

** For every non-empty set S there is a binary operation defined on S that makes it a group.

** Tychonoff's theorem stating that every product of compact topological spaces is compact.

** In the product topology, the closure of a product of subsets is equal to the product of the closures.

** If S is a set of sentences of first-order logic and B is a consistent subset of S, then B is included in a set that is maximal among consistent subsets of S. The special case where S is the set of all first-order sentences in a given signature is weaker, equivalent to the Boolean prime ideal theorem ; see the section " Weaker forms " below.

** Any union of countably many countable sets is itself countable.

** If the set A is infinite, then there exists an injection from the natural numbers N to A ( see Dedekind infinite ).

** Every infinite game in which is a Borel subset of Baire space is determined.

** The Vitali theorem on the existence of non-measurable sets which states that there is a subset of the real numbers that is not Lebesgue measurable.

** The Lebesgue measure of a countable disjoint union of measurable sets is equal to the sum of the measures of the individual sets.

** The Nielsen – Schreier theorem, that every subgroup of a free group is free.