Measurement multiplication factors designation in SI Units  
  Yocto (y)     Refers to 10-24 factor in SI units (1 yocto m = 0.000000000000000000000001 m)  
  Zepto (z)     Refers to 10-21 factor in SI units (1 zepto m = 0.000000000000000000001 m)  
  Atto (a)     Refers to 10-18 factor in SI units (1 atto m = 0.000000000000000001 m)  
  Femto (f)     Refers to 10-15 factor in SI units (1 femto m = 0.000000000000001 m)  
  Pico (p)     Refers to 10-12 factor in SI units (1 pico m = 0.000000000001 m)  
  Nano (n)     Refers to 10-9 factor in SI units (1 nano m= 0.000000001 m)  
  Micro (μ)     Refers to 10-6 factor in SI units (1 μm = 0.000001 m)  
  Milli (m)     Refers to 10-3 factor in SI units (1 mm = 0.001 m)  
  Centi (c)     Refers to 10-2 factor in SI units (1 cm = 0.01 m)  
  Deci (d)     Refers to 10-1 factor in SI units (1 deci m = 0.1 m)  
  Deca (da)     Refers to 101 factor in SI units (1 decameter = 10 m)  
  Hecto (h)     Refers to 102 factor in SI units (1 hectometer = 100 m)  
  Kilo (k)     Refers to 103 factor in SI units (1 km = 1000 m)  
  Mega (M)     Refers to 106 factor in SI units (1 MHz = 1000000 Hz)  
  Giga (G)     Refers to 109 factor in SI units (1 GHz = 1000000000 Hz)  
  Tera (T)     Refers to 1012 factor in SI units (1 TB = 1000000000000 bytes)  
  Peta (P)     Refers to 1015 factor in SI units (1 PB = 1000000000000000 bytes)  
  Exa (E)     Refers to 1018 factor in SI units (1 EB = 1000000000000000000 bytes)  
  Zetta (Z)     Refers to 1021 factor in SI units (1 ZB = 1000000000000000000000 bytes)  
  Yotta (Y)     Refers to 1024 factor in SI units (1Y byte = 1000000000000000000000000 bytes)  

Reference:
1. Bureau International des Poids et Mesures BIPM (SI Units)
2. Designation of Frequency
3. Designation of Memory/Data Storage
4. System of Units Unit of Measure (UOM)
5. Large Number Designation



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