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mega = 106 giga = 109 tera = 1012 exa = 1015 peta = 1018
K is short for Kilo and also for thousand, M is short of Mega and also for million, G is short for Giga and for billion, followed by: * Tera -- trillion * Peta -- quadrillion * Exa -- quintillion * Zetta -- sextillion ...and from there, you're on your own ;}
They are yocto (septillionth) zepto (sextillionth) atto (quintillionth) femto (quadrillionth) pico (trillionth) nano (billionth) micro (millionth) milli (thousandth) centi (hundredth) deci (tenth) UNIT deca (ten) hecto (hundred) kilo (thousand) mega (million) giga (billion) tera (trillion) peta (quadrillion) exa (quintillion) zetta (sextillion) yotta (septillion).
Here's the full list of SI units I know of from largest to smallest: Yotta - Y - One septillion. (1,000,000,000,000,000,000,000,000) i.e. One yottameter / Zetta - Z - One sextillion. (1,000,000,000,000,000,000,000) i.e. One zettameter / Exa - E - One quintillion. (1,000,000,000,000,000,000,) i.e. One exameter / Peta - P - One quadrillion. (1,000,000,000,000,000) i.e. One petameter / Tera - T - One trillion. (1,000,000,000,000) i.e. One terameter / Giga - G - One billion. (1,000,000,000) i.e. One gigameter / Mega - M - One million. (1,000,000) i.e. One megameter / Kilo - k - One thousand. (1,000) i.e. One kilometer / Hecto - h - One hundred. (100) i.e. One hectometer / Deka - da - One ten. (10) i.e. One dekameter / Base - . - One (1) i.e. One meter / Deci - d - One tenth (.1) i.e. One decimeter / Centi - c - One hundredth (.01) i.e. One centimeter/ Milli - m - One thousandth (.001) i.e. One millimeter / Micro - μ - One millionth (.000001) i.e. One micrometer / Nano - n - One billionth (.000000001) i.e. One nanometer / Pico - p - One trillionth (.000000000001) i.e. One picometer / Femto - f - One quadrillionth (.000000000000001) i.e. One femtometer / Atto - a - One quintillionth (.000000000000000001) i.e. One attometer / Zepto - z - One sextillionth (.000000000000000000001) i.e. One zeptometer / Yocto - y - One septillionth (.000000000000000000000001) i.e. One yoctometer
The next larger number (by thousands) is unvigintillion (1066).Decimal and Multiple Names (US or short scale)-42....................................................................... tredecillionth.............................................. Old Latin - - 10 -42-39....................................................................... duodecillionth............................................ Old Latin - - 10 -39-36....................................................................... undecillionth.............................................. Old Latin - - 10 -36-33....................................................................... decillionth .................................................. revo - r 10 -33-30....................................................................... nontillionth................................................. tredo - t 10 -30-27....................................................................... odillionth.................................................... syto - s 10 -27-24....................................................................... septillionth.................................................. yocto - y 10 -24-21....................................................................... sextillionth.................................................. zetto - z 10 -21-18....................................................................... quintillionth................................................ atto - a 10 -18-15....................................................................... quadrillionth............................................... femto - f 10 -15-12....................................................................... trillionth....................................................... pico (second) - p 10 -12-9......................................................................... billionth....................................................... nano (second) - n 10 -9-6......................................................................... millionth...................................................... micro (second) - µ 10 -6-3......................................................................... thousanth.................................................... milli (second) - m 10 -3-2......................................................................... hundredth................................................... centi - c 10 -2-1......................................................................... tenth............................................................ deci - d 10 -10.......................................................................... zero...................................................... nil - -0- 01.......................................................................... ten................................................................ deca - Da 10^12.......................................................................... hundred...................................................... hecto - H 10^23.......................................................................... thousand..................................................... kilo - K 10^34.......................................................................... myrid........................................................... (slang) - - 10^46.......................................................................... million......................................................... mega - M 10^6 or 10^3^2 places9.......................................................................... billion.......................................................... giga - G 10^912........................................................................ trillion.......................................................... tera - T 10^1215........................................................................ quadrillion.................................................. peta - P 10^1518........................................................................ quintillion.................................................... exa - E 10^1821........................................................................ sextillion..................................................... zetto - Z 10^2124........................................................................ septillion..................................................... yotta - Y 10^2427........................................................................ octillion....................................................... nea - N 10^2730........................................................................ nonillion..................................................... dea - D 10^30 or 10^5^6 places33........................................................................ decillion...................................................... una - U 10^3336........................................................................ undecillion.................................................. Old Latin 10^3639........................................................................ duodecillion............................................... Old Latin 10^3942........................................................................ tredecillion.................................................. Old Latin 10^4245........................................................................ quadttuordecillion...................................... Old Latin 10^4548........................................................................ quindecillion.............................................. Old Latin 10^4851........................................................................ sexdecillion................................................ Old Latin 10^5154........................................................................ septemdecillion.......................................... Old Latin 10^5457........................................................................ octodecillion.............................................. Old Latin 10^5760........................................................................ novemdecillion.......................................... Old Latin 10^6063........................................................................ vigintillion................................................... Old Latin 10^6366........................................................................ unvigintillion.............................................. Old Latin 10^6669........................................................................ duovigintillion............................................ Old Latin 10^6972........................................................................ tresvigintillion............................................ Old Latin 10^7275........................................................................ quattuortillion............................................. Old Latin 10^7578........................................................................ quintillion.................................................... Old Latin 10^7881........................................................................ sestillion..................................................... Old Latin 10^8184........................................................................ septemtillion............................................... Old Latin 10^8487........................................................................ octotillion.................................................... Old Latin 10^8790........................................................................ novemtillion................................................ Old Latin 10^9093........................................................................ trigintillion.................................................. Old Latin 10^9396........................................................................ untrigintillion.............................................. Old Latin 10^9699........................................................................ duotrigintillion............................................ Old Latin 10^99 ]100................(10 duotrigintillion)........................1 googol (10100)303................(101 groups of three zeroes)........centillion (10303)A "googolplex" is 10googol , i.e. a googol of zeroes as the exponent. This is larger than the estimated number of atomic particles in the known universe.There is a proposed Greek naming system that would supplant these US and the competing European system (counting by millions).(see the related link)