Technical Terms

Current categories are as follows:

Polygons

The following list gives the name of a polygon with the specified number of sides:

3
triangle
4
tetragon (quadrilateral)
5
pentagon
6
hexagon
7
heptagon
8
octagon
9
enneagon
10
decagon
11
hendecagon
12
dodecagon
13
tridecagon
14
tetradecagon
15
pentadecagon
16
hexadecagon
17
heptadecagon
18
octadecagon
19
enneadecagon
20
icosagon
21
heneicosagon
22
docosagon
23
tricosagon
24
tetracosagon
25
pentacosagon
26
hexacosagon
27
heptacosagon
28
octacosagon
29
enneacosagon
30
triacontagon
40
tessaracontagon
50
pentecontagon
60
hexacontagon
70
heptacontagon
80
octacontagon
90
enneacontagon
100
hectagon

Large numbers

The table below gives the names of large numbers and power of ten (number of zeroes) represented in the American and British systems of nomenclature. The German nomenclature is similar to the British. The French nomenclature was formerly similar to the American but now is like the British and German.
Number American British
million 6 6
milliard 9
billion 9 12
trillion 12 18
quadrillion 15 24
quintillion 18 30
sextillion 21 36
septillion 24 42
octillion 27 48
nonillion 30 54
decillion 33 60
undecillion 36 66
duodecillion 39 72
tredecillion 42 78
quattuordecillion 45 84
quindecillion 48 90
sexdecillion 51 96
septendecillion 54 102
octodecillion 57 108
novemdecillion 60 114
vigintillion 63 120
unvigintillion 66 126
trigintillion 93 180
quadrigintillion 123 240
quinquegintillion 153 300
sexagintillion 183 360
septuagintillion 213 420
octogintillion 243 480
nonagintillion 273 540
centillion 303 600
googol 100 100
googolplex 1 googol 1 googol
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