An octagon that is not irregular is a regular octagon, one in which each of the eight sides os the same length
Simply that: "irregular octagon".
An octagon can be an irregular shape, but a regular octagon has all sides and angles equal.
An octagon. Or more specifically, an irregular octagon.
It is a shape that has 8 sides but does not look like a regular octagon. As long as it has 8 sides it is an irregular octagon.
It can be regular or irregular although irregular is more probable.
A regular octagon will not tessellate but an irregular one can.
A regular octagon will not tessellate but an irregular one can.
None, if it is an irregular octagon.
A regular octagon will not tessellate but an irregular one will.
A regular octagon will not tessellate but an irregular one can.
An irregular octagon.
An irregular octagon is one in which one of the sides is not the same length as the others or one of the angles is different from the rest.