quandle
Noun
Meaning
quandle (plural quandles)
(mathematics) A rack,
Q
{\displaystyle \scriptstyle \mathrm {Q} \,}
, such that
∀
a
∈
Q
{\displaystyle \scriptstyle \forall a\;\in \;\mathrm {Q} }
a
▹
a
=
a
{\displaystyle a\triangleright a=a}
or equivalently
a
◃
a
=
a
{\displaystyle a\triangleleft a=a}
.