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