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Ancient Indian Numbering System
See also "Chaturanginee Army"

In the present Indian counting system:

USA System                                                  Indian System
100,000         100 Thousand  is                1,00,000       One Lakh
1,000,000      1 Million  is                         10,00,000       Ten Lakh
10,000,000    10 Million   is                  1,00,00,000      One Crore
100,000,000  100 Million is                 10,00,00,000      Ten Crore

But the ancient Indian legionaries have names like:

"Ayut"         = One thousand; 1,000 per unit
"Shanku"     = One trillion; (1,000,000,000,000) or 10¹²
"Arbud"       = 1,000 Shanku
"Madhyam" = 10 Arbud
"Antya"       = 10 Madhyam
"Samudra"  = 20 Antya
"Paraardh"  = 30 Samudra

These numbers have been described by Sugreev to Raam while giving the count of his military power. Some say about this that "Sugreev meant that innumerable monkeys were coming"; while others hold the view that ancient Hindu organized their military pattern in a particular nomenclature apart from the generalized numbers.

The present Indian system is taken from Indian astrology in which every number is increased by a multiplication of ten - 1, 10, 100, 1,000, 10,000 etc. (This is called decimal system - originated from "deca", means 10). As said in verse:

Ekam dash shatam asmat sahastram ayutam tatah param laksham |
Prayutam kotim ath arbudam vrindey kharvam nikharvam cha ||
Tasmat mahaa sarojam shankum saritaam patim twat antam |
Madhyam paraadham aaryuhya ath uttaram dash gunam tathaa gyeyam ||

Leelaavatee mathematics also says:

ek dash sahastra aayut laksh prayut kotyah kramashah |
arbudam abdam kharv nikharvam mahaapadmam shankhvah tasmaat ||
nidhih cha antam madhyam parardham iti dash gunaa uttaram sangyaah |
sankhyaaya sthaanaanaam vyavahaar artham kritaah poorvaih iti ||
[Taken from Valmiki Ramayan 4/39/44]

It means that,
one = 1
1 ten = 10; 
10 ten = 1 hundred; 
10 hundred = 1 thousand (Ayut)
10 thousand
100 thousand = 1 lakh
1 prayutam =10 lakh, = 1 million; 
100 lakh = 1 koti =1 crore; 
100 crore = 1 arbud (Arab) = 1 billion 
100 arbud = 1 vrinda 
100 vrinda = 1 kharv (Kharab)
100 kharv = 1 nikharv (Neel)
100 nikharv = 1 mahaa padm (Padm)
100 mahaa padm = 1 shanku (Shankh) = 1 lakh crore
100 shanku = 1 samudra
100 samudra = 1 antya
100 antya = 1 madhyam
100 madhyam = 1 paraardh

By this, the nomenclature of million, billion and trillion, was in ancient days. This may be observed by the names "Prayutam" ( a million); "arbud" (a billion); "shanku" (a trillion) ...