Technical terms for polygons and large numbers

Technical terms for polygons and large numbers

Current categories are as follows:

Polygons

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

SidesName
3triangle
4tetragon (quadrilateral)
5pentagon
6hexagon
7heptagon
8octagon
9enneagon (nonagon)
10decagon
11hendecagon
12dodecagon
13tridecagon (triskaidecagon)
14tetradecagon (tetrakaidecagon)
15pentadecagon (pentakaidecagon)
16hexadecagon (hexakaidecagon)
17heptadecagon (heptakaidecagon)
18octadecagon (octakaidecagon)
19enneadecagon (enneakaidecagon)
20icosagon
21henicosagon
22docosagon
23tricosagon
24tetracosagon
25pentacosagon
26hexacosagon
27heptacosagon
28octacosagon
29enneacosagon
30triacontagon
31hentriacontagon
32dotriacontagon
33tritriacontagon
34tetratriacontagon
35pentatriacontagon
36hexatriacontagon
37heptatriacontagon
38octatriacontagon
39enneatriacontagon
40tetracontagon
50pentacontagon
60hexacontagon
70heptacontagon
80octacontagon
90enneacontagon
100hectagon

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
billiard 15
trillion 12 18
trilliard 21
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
duovigintillion 69 132
trevigintillion 72 138
quattuorvigintillion 75 144
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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