大きさ  プレフィックス  記号        適用       語源                              
                                                                              
10^24      yotta        Y         1991       otto, eight in Italian           
10^21      zetta        Z         1991       sette, seven in Italian          
10^18      exa          E         1975       hex, six in Greek                
10^15      peta         P         1975       pente, five in Greek             
10^12      tera         T         1960       teras, monster in Greek          
10^9       giga         G         1960       gigas, giant in Greek            
10^6       mega         M         1960       megas, huge in Greek             
1000       kilo         k         1795       khilioi, thousand in Greek       
100        hecto        h         1795       hekaton, hundred in Greek        
10         deka       da, dk      1795       deka, ten in Greek               
                                                                              
1/10       deci         d         1795       decimus, tenth in Latin          
1/100      centi        c         1795       centum, hundred in Latin         
1/1000     milli        m         1795       mille, thousand in Latin         
10^(-6)    micro      mu, u, mc   1960       mikros, small in Greek           
10^(-9)    nano         n         1960       nanos, dwarf in Greek            
10^(-12)   pico         p         1960       piccolo, little bit in Spanish   
10^(-15)   femto        f         1964       femten, 15 in Norwegian/Danish   
10^(-18)   atto         a         1964       atten, 18 in Norwegian/Danish    
10^(-21)   zepto        z         1991       sept, seven in Greek             
10^(-24)   yocto        y         1991       okto, eight in Greek              

Factor     Prefix     Symbol     Example                                      
                                                                              
 2^10       kibi        Ki       1 kibibyte = KiB = 1024 bytes                
 2^20       mebi        Mi       1 mebibyte = MiB = 1048576 bytes             
 2^30       gibi        Gi       1 gibibyte = GiB = 1073741824 bytes          
 2^40       tebi        Ti       1 tebibyte = TiB = 1099511627776 bytes       
 2^50       pebi        Pi       1 pebibyte = PiB = 1125899906842624 bytes    
 2^60       exbi        Ei       1 exbibyte = EiB = 1152921504606846976 bytes  

convert/units, Units, Units/Overview