(n) :
A conical hat that a school pupil is forced to wear to indicate that he or she is a dunce.
(n) :
The topological space obtained by identifying the sides comprising the boundary of a triangle, two sides with consistent orientation and the third with the reverse orientation.
(n) :
A conical hat that a school pupil is forced to wear to indicate that he or she is a dunce.
(n) :
The topological space obtained by identifying the sides comprising the boundary of a triangle, two sides with consistent orientation and the third with the reverse orientation.