Polygons
Greek Numerical Prefixes

Here is a list of common Greek prefixes used in naming polyhedra:
1 mono
2 di
3 tri
4 tetra
5 penta
6 hexa
7 hepta
8 octa
9 ennea
10 deca
11 hendeca
12 dodeca
13 triskaideca
14 tetrakaideca
15 pentakaideca
16 hexakaideca
17 heptakaideca
18 octakaideca
19 enneakaideca
20 icosa
24 icositetra
30 triconta or triaconta
60 hexaconta
90 enneaconta
100 hecto or hecato