There are several similarities between the measurement system used in Tamil Nadu and that used by the Indus Valley civilization. 1= onRu 10= patthu 100= nooRu 1000= aayiram 10,000= pathaayiram 100,000= nooRaayiram 1000,000= meiyiram 10^9= thoLLunn 10^12= eegiyam 10^15= neLai 10^18= iLanji 10^20= veLLam 10^21= aambal Tamil texts elaborate the following version: 1 = ONDRU- one 10 = PATHU- ten 100 = NOORU- hundred 1,000 = AAYIRAM- thousand 10,000 = PATHAAYIRAM- ten thousand 100,000 = LATCHAM- hundred thousand 1,000,000 = PATHU LATCHAM- one million 10,000,000 = KODI- ten million 100,000,000 = ARPUTHAM- hundred million 1,000,000,000 = NIGARPUTHAM- one billion 10,000,000,000 = KUMBAM- ten billion 100,000,000,000 = KANAM- hundred billion 1,000,000,000,000 = KARPAM- one trillion 10,000,000,000,000 = NIKARPAM- ten trillion 100,000,000,000,000 = PATHUMAM- hundred trillion 1,000,000,000,000,000 = SANGGAM- quadrillion 10,000,000,000,000,000 = VELLAM- ten quadrillion 100,000,000,000,000,000 = ANNIYAM- hundred quadrillion 1,000,000,000,000,000,000 = ARTTAM- one quintillion 10,000,000,000,000,000,000 = PARARTTAM- ten quintillion 100,000,000,000,000,000,000 = POORIYAM- hundred quintillion 1,000,000,000,000,000,000,000 = MUKKODI- one sextillion 10,000,000,000,000,000,000,000 = MAHAYUGAM- ten sextillion -- 1 Valley -Veļi = 7 kāni = 6.43 acres = 2.6 hectares