SI, Metric Prefixes for Large and Small Numbers:
Prefix Symbol Value and their Meaning
Yotta--- Y --- 10^24 --- septillion
Zetta--- Z --- 10^21 --- sextillion
Exa----- E --- 10^18 --- quintillion
Peta---- P --- 10^15 --- quadrillion
Tera---- T --- 10^12 --- trillion
Giga---- G --- 10^9 ---- billion
Mega---- M --- 10^6 ---- million
myria--- my -- 10^4 ---- ten thousand
kilo---- k --- 10^3 ---- thousand
hecto--- h --- 10^2 ---- hundred
deka---- da--- 10 ------ ten
-------------------------------------
deci---- d --- 10^-1 ---- tenth
centi--- c --- 10^-2 ---- hundredth
milli--- m --- 10^-3 ---- thousandth
micro--- u --- 10^-6 ---- millionth
nano---- n --- 10^-9 ---- billionth
pico---- p --- 10^-12 --- trillionth
femto--- f --- 10^-15 --- quadrillionth
atto---- a --- 10^-18 --- quintillionth
zepto--- z --- 10^-21 --- sextillionth
yocto--- y --- 10^-24 --- septillionth
Latin Numbers and Prefix [Examples in brackets]:
1 = unus -------- uni [unary, unitary, unilateral]
2 = duo --------- bi, duo [binary, duple, biennial]
3 = tres, tria -- tri, ter [tertial, trinary, ternary]
4 = quattuor ---- quadri, quart [quartal, quaternary, quadriennial, quadrillion]
5 = quinque ----- quinque, quint [quintal, quinary, quinquenary, quinquennial]
6 = sex --------- sex(t), se [sextal, senary, sexenary]
7 = septem ------ sept [septimal, septenary, septet, septuple]
8 = octo -------- oct [octal, octaval, octonary, octet]
9 = novem ------- nonus, novem [nonal, nonary, nonet, nonuple]
10 = decem ------ dec(a), de [decimal, denary, dectet, decuple]
11 = undecim ---- undec, unde [undecimal, undenary, undecillion]
12 = duodecim --- duodec, duode [duodecimal, duodenary, duodecennial]
13 = tredecim -------- tredec, tridec [tridecimal, tridenary]
14 = quattuordecim --- quatuordec [quatuordecimal, quatuordenary]
15 = quindecim ------ quinde(c) [quindecimal, quindenary]
16 = sedecim --------- sede(c) [hexadecimal, sedenary]
17 = septendecim ----- septende(c) [septendecimal, septendenary]
18 = duodeviginti ---- decennoct [decennoctal, decenoctonary]
19 = undeviginti ----- decennov [decennoval, decennonary]
20 = viginti --------- vige, vice [vigesimal, vicesimal, vigenary, vicenary]
30 = triginta -------- trige, trice [trigesimal, tricenary]
40 = quadraginta ----- quadrage [quadragesimal, quadragenary]
50 = quinquaginta ---- quinquage [quinquagesimal, quinquagenary]
60 = sexaginta ------- sexage [sexagesimal, sexagenary]
70 = septuaginta ----- septuage [septuagesimal, septuagenary]
80 = octoginta ------- octage [octagesimal, octogenary]
90 = nonaginta ------- nonage [nonagesimal, nonagenary]
100 = centum --------- cente [centesimal, centenary, century, centennial]
1000 = mille --------- mille [millesimal, millenary, millennium, millennial]
Greek Numbers and their Prefixes [Examples in brackets]:
1 = en -------------------- eis, mia, ev, mono [monarch, monad, monogamy]
2 = dyo, duo, di ---------- duo, dis, di, dy [diarch, dyarch, dimeter, dyad, biathlon, bicycle]
3 = treis, tria ----------- treis, tria, tris, tri [triad, tripod, triangle]
4 = tessera --------------- tettares, tettara, terakis, tetra, quad [tetrahedron, tetragramaton, tetrapack, quadrangle, quadrilateral]
5 = pente ----------------- pente, pentakis, penta [pentagon, pentangle, pentameter, pentecost]
6 = hexa ------------------ hex, hexa [hexagon, hexahedron, hexangle, hexameter, hex bolt]
7 = hepta ----------------- hepta, hepta [heptagon, heptameter, heptangle]
8 = okto ------------------ octô, octa [octagon, octave, octopus, octohedron]
9 = ennea ----------------- ennea, nona [nonagon, nano technology, ennead,enneahedron]
10 = deka ----------------- deca [decameter, decathlon, decagon, decade, decapolis]
11 = hendeka -------------- endeca, undeca, hendeca [hendecagon, undecagon, hendecarch, hendecahedron]
12 = dodeka --------------- dodeca [dodecagon, dodecahedron, dodecathlon]
13 = treiskaideka --------- triskaideca, trideca [triskaidecagon, trisdecagon, triskaidecahedron]
14 = tettares kai deka ---- tetrakaideca, tetradeca [tetradecagon, tetrakaidecagon, tetrakaidecahedron]
15 = pentekaideka --------- pendeca [pendecagon, pendecahedron]
16 = hekkaideka ----------- hexadeca [hexadecagon, hexadecahedron, hexadecimal]
17 = heptakaideka --------- heptadeca [heptadecagon, heptadecahedron]
18 = oktôkaideka ---------- octodeca [octodecagon, octodecahedron]
19 = enneakaideka --------- enneadeca [enneadecagon, enneadecahedron]
20 = eikosi (icosa-) ------ icos(a) [icosagon, icosahedron]
100 = hekaton ------------- hecato [hecatogon, hecatohedron]
1000 = chilioi, chiliai --- chilia [chiliagon, chiliahedron]
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