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  Mathematical Notation for Orders of Magnitude
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Mathematical Power Name
10ˆ18 or 1,000,000,000,000,000,000  one quintillion 
10ˆ15 or 1,000,000,000,000,000  one quadrillion 
10ˆ12 or 1,000,000,000,000  one trillion 
10ˆ9 or 1,000,000,000  one billion 
10ˆ6 or 1,000,000  one million 
10ˆ3 or 1,000  one thousand 
10ˆ2 or 100  one hundred 
10ˆ1 or 10  ten 
10ˆ0 or 1  one 
10ˆ-1 or 0.1  one-tenth 
10ˆ-2 or 0.01  one-hundredth 
10ˆ-3 or 0.001  one-thousandth 
10ˆ-6 or 0.000 001  one-millionth 
10ˆ-9 or 0.000 000 001  one-billionth 
10ˆ-12 or 0.000 000 000 001  one-trillionth 
10ˆ-15 or 0.000 000 000 000 001  one-quadrillionth 
10ˆ-18 or 0.000 000 000 000 000 001  one-quintillionth 
Orders of Magnitude - Digital Data
Bit:
An eighth of a byte
This is the smallest fundamental size of data storage. It is a binary digit meaning that it can take the value of either 1 or 0. All computer data can be broken down to a string of these 1 and 0. When represented as a string it is called binary code.
Byte: 8 Bits A single byte stores eight bits, eight 1's or 0's. This octet of bits is the smallest unit for a base 1,000 order of magnitude naming system as follows:
Kilobyte: 1 thousand or, 1,000 bytes
Megabyte: 1 million, or 1,000,000 bytes
Gigabyte: 1 billion, or 1,000,000,000 bytes
Terabyte: 1 trillion, or 1,000,000,000,0000 bytes
Petabye: 1 quadrillion, or 1,000,000,000,000,000 bytes
Exabyte: 1 quintillion, or 1,000,000,000,000,000,000 bytes
Zettabyte: 1 sextillion or 1,000,000,000,000,000,000,000
Yottabyte: 1 septillion, or 1,000,000,000,000,000,000,000,000 bytes