glvalue
A value that is either an xvalue or an lvalue.
Together, xvalues and lvalues are called “glvalues” (“generalized” lvalues). […] If the second and third operands are glvalues of the same value category and have the same type, the result is of that type and value category and it is a bit-field if the second or the third operand is a bit-field, or if both are bit-fields.
Where it comes from
Short for generalized lvalue. According to Bjarne Stroustrup, coined by ISO/IEC JTC 1/SC 22 in 2010.
Adapted from the Wiktionary entry glvalue (CC BY-SA 4.0).