⊖ Explained

⊖ is the Unicode character "circled minus" (U+2296).⊖ is also known as the Plimsoll symbol.⊖ may refer to:

Symmetric difference, the set of elements which are in either of two sets but not in their intersection
Erosion (morphology), one of the fundamental operations in morphological image processing
A function for reversal and rotation in the APL programming language
Symbol for the Escape character in ISO 2047
Used to designate a thermodynamic quantity in the Standard state in chemistry
Part of the notation for Standard enthalpy of reaction, as in ΔH^⊖_reaction

See also