U+2A91 "⪑" Less-than Above Greater-than Above Double-Line Equal Unicode Character

U+2A91 "⪑" Less-than Above Greater-than Above Double-Line Equal is a mathematical symbol used primarily in formal logic and set theory to represent a relational operator that combines a less-than sign above a greater-than sign, both positioned above a double-line equal sign. This complex glyph typically denotes a relation where one value is not only comparable but also explicitly not equal to another, often indicating a strict ordering or a specific type of inequality with an underlying equivalence structure. It belongs to the Supplemental Mathematical Operators block and is rarely used outside specialized academic or technical texts, where clarity about partial orders or non-transitive relations is essential.