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The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2] [3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait.
A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...
In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.
This page is subject to the extended confirmed restriction related to the Arab-Israeli conflict. An inverted red triangle Since the Israeli invasion of the Gaza Strip, an inverted red triangle has been used by pro-Palestinian protesters. The red triangle as a Palestinian symbol dates back to the Arab Revolt, after which it was also used in the Palestinian flag. More recently, combat footage ...
the nabla symbol Del , or nabla , is an operator used in mathematics (particularly in vector calculus ) as a vector differential operator , usually represented by the nabla symbol ∇ . When applied to a function defined on a one-dimensional domain, it denotes the standard derivative of the function as defined in calculus .
A symbol on the Brazilian state flag of Minas Gerais; Red triangle (Channel 4), British television content warning system symbol; Red Triangle (family planning), the symbol for family planning health and contraception services; Red triangle (Palestinian symbol), a symbol used by the Palestinian militant group Hamas and pro-Palestinian protesters
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
The following table lists many specialized symbols commonly used in modern mathematics, ordered by their introduction date. The table can also be ordered alphabetically by clicking on the relevant header title.