⊖ is the Unicode character "circled minus" (U+2296). ⊖ is also known as the

Plimsoll symbol The load line, also known as Plimsoll line, indicates the legal limit to which a ship may be loaded for specific water types and temperatures in order to safely maintain buoyancy, particularly with regard to the hazard of waves. The load line is ...

. ⊖ may refer to: *

Symmetric difference In mathematics, the symmetric difference of two sets, also known as the disjunctive union and set sum, is the set of elements which are in either of the sets, but not in their intersection. For example, the symmetric difference of the sets \ and ...

, the set of elements which are in either of two sets but not in their intersection *

Erosion (morphology) Erosion (usually represented by ⊖) is one of two fundamental operations (the other being dilation) in morphological image processing from which all other morphological operations are based. It was originally defined for binary images, later b ...

, one of the fundamental operations in morphological image processing * A function for reversal and rotation in the

APL programming language APL (named after the book ''A Programming Language'') is a programming language developed in the 1960s by Kenneth E. Iverson. Its central datatype is the multidimensional array. It uses a large range of special graphic symbols to represent m ...

* Symbol for the

Escape character In computing and telecommunications, an escape character is a character that invokes an alternative interpretation on the following characters in a character sequence. An escape character is a particular case of metacharacters. Generally, the ...

ISO 2047 ISO 2047 (Information processing – Graphical representations for the control characters of the 7-bit coded character set) is a standard for graphical representation of the control characters for debugging purposes, such as may be found in t ...

* Used to designate a thermodynamic quantity in the

Standard state The standard state of a material (pure substance, mixture or solution) is a reference point used to calculate its properties under different conditions. A degree sign (°) or a superscript ⦵ symbol (⦵) is used to designate a thermodynamic q ...

in chemistry * Part of the notation for

Standard enthalpy of reaction The standard enthalpy of reaction (denoted \Delta H_^\ominus) for a chemical reaction is the difference between total product and total reactant molar enthalpies, calculated for substances in their standard states. The value can be approximately i ...

, as in Δ''H''^⊖_reaction

See also