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A product sign with a short vertical bar on one side, marking which factor is normal.
Also known as: Semidirect product, Twisted product, Product with a bar
The semidirect product sign builds a group from two smaller ones where only one factor is normal, and the little bar points at that factor. Which side the bar sits on is the entire information the symbol carries, so a mirrored glyph asserts the opposite structure.
Denotes the semidirect product of two groups, the vertical stroke placed against the normal subgroup.
Contexts: Mathematics
Reduces to the direct product when both factors are normal, which is what the plain ⋉/⋊ pair distinguishes from ×.
Contexts: Mathematics
A diagonal cross with a short upright stroke added along one of its vertical sides, forming a closed triangle on that side.