konstantsid
Konstantsid is a neologism encountered in some Scandinavian-language mathematical discussions to denote a side of a geometric figure whose length is kept fixed under a given set of conditions. The word is formed from roots meaning constant (konstant/konstants) and side (sid/side), and it is used to emphasize invariance of one edge while other elements may vary.
In geometry and kinematics, a konstantsid represents a parameter that remains unchanged as a figure is transformed
Usage and recognition vary by region and pedagogy. Konstantsid is not a standard term in formal mathematical
See also: constant, fixed length, invariant, polygon, geometric constraint.