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Astronomical symbols – Symbols in astronomy; Chemical symbol – Abbreviations used in chemistry; Chinese punctuation – Punctuation used with Chinese characters; Currency symbol – Symbol used to represent a monetary currency's name; Diacritic – Modifier mark added to a letter (accent marks etc.)
Semiotics is the theory of symbols and falls in three parts; logical syntax, the theory of the mutual relations of symbols, logical semantics, the theory of the relations between the symbol and what the symbol stands for, and; logical pragmatics, the relations between symbols, their meanings and the users of the symbols." [29]
According to Ferdinand de Saussure (1857–1913), a sign is composed of the signifier [2] (signifiant), and the signified (signifié).These cannot be conceptualized as separate entities but rather as a mapping from significant differences in sound to potential (correct) differential denotation.
Thus, a symbol denotes by virtue of its interpretant. Its sign-action (semiosis) is ruled by habit, a more or less systematic set of associations that ensures its interpretation. For Peirce, every symbol is general, and that which we call an actual individual symbol (e.g., on the page) is called by Peirce a replica or instance of the symbol. [45]
French semiotician Roland Barthes used signs to explain the concept of connotation—cultural meanings attached to words—and denotation—literal or explicit meanings of words. [2] Without Saussure's breakdown of signs into signified and signifier, however, these semioticians would not have had anything to base their concepts on.
The denotative meaning of a signifier is intended to communicate the objective semantic content of the represented thing. So, in the case of a lexical word, say "book", the intention is to do no more than describe the physical object. Any other meanings or implications will be connotative meanings.
An extensional definition gives meaning to a term by specifying its extension, that is, every object that falls under the definition of the term in question.. For example, an extensional definition of the term "nation of the world" might be given by listing all of the nations of the world, or by giving some other means of recognizing the members of the corresponding class.
newton per coulomb (N⋅C −1), or equivalently, volt per meter (V⋅m −1) energy: joule (J) Young's modulus: pascal (Pa) or newton per square meter (N/m 2) eccentricity: unitless Euler's number (2.71828, base of the natural logarithm) unitless electron: unitless elementary charge: coulomb (C) force