Haken

Etymology
For, who studied these manifolds.

Adjective

 * 1)  Irreducible, compact, and containing a non-∂-parallel incompressible surface (besides a sphere or disk).

Etymology
From, from , from , from , from. Cognate with 🇨🇬.

One of the rare words with a long vowel followed by an original geminate, which was later simplified. Cognate with 🇨🇬. Further related with 🇨🇬, 🇨🇬, 🇨🇬.

Noun

 * 1) hook
 * 2) catch, hitch a concealed difficulty, especially in a deal or negotiation
 * 3) checkmark