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 for quantifiers
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  quantifiers
  
  
      In techspeak and jargon, the standard metric prefixes used in the SI
      (Syst?me International) conventions for scientific measurement have dual
      uses. With units of time or things that come in powers of 10, such as
      money, they retain their usual meanings of multiplication by powers of 1000
      = 10^3. But when used with bytes or other things that naturally come in
      powers of 2, they usually denote multiplication by powers of 1024 = 2^10.
  
      Here are the SI magnifying prefixes, along with the corresponding binary
      interpretations in common use:
  
  
      prefix  decimal  binary
      kilo-   1000^1   1024^1 = 2^10 = 1,024
      mega-   1000^2   1024^2 = 2^20 = 1,048,576
      giga-   1000^3   1024^3 = 2^30 = 1,073,741,824
      tera-   1000^4   1024^4 = 2^40 = 1,099,511,627,776
      peta-   1000^5   1024^5 = 2^50 = 1,125,899,906,842,624
      exa-    1000^6   1024^6 = 2^60 = 1,152,921,504,606,846,976
      zetta-  1000^7   1024^7 = 2^70 = 1,180,591,620,717,411,303,424
      yotta-  1000^8   1024^8 = 2^80 = 1,208,925,819,614,629,174,706,176
  
      Here are the SI fractional prefixes:
  
  
      prefix  decimal     jargon usage
      milli-  1000^-1     (seldom used in jargon)
      micro-  1000^-2     small or human-scale (see micro-)
      nano-   1000^-3     even smaller (see nano-)
      pico-   1000^-4     even smaller yet (see pico-)
      femto-  1000^-5     (not used in jargon?yet)
      atto-   1000^-6     (not used in jargon?yet)
      zepto-  1000^-7     (not used in jargon?yet)
      yocto-  1000^-8     (not used in jargon?yet)
  
      The prefixes zetta-, yotta-, zepto-, and yocto- have been included in these
      tables purely for completeness and giggle value; they were adopted in 1990
      by the 19th Conference Generale des Poids et Mesures. The binary peta- and
      exa- loadings, though well established, are not in jargon use either ? yet.
      The prefix milli-, denoting multiplication by 1/1000, has always been rare
      in jargon (there is, however, a standard joke about the millihelen ?
      notionally, the amount of beauty required to launch one ship). See the
      entries on micro-, pico-, and nano- for more information on
      connotative jargon use of these terms. ?Femto? and ?atto? (which,
      interestingly, derive not from Greek but from Danish) have not yet acquired
      jargon loadings, though it is easy to predict what those will be once
      computing technology enters the required realms of magnitude (however, see
      attoparsec).
  
      There are, of course, some standard unit prefixes for powers of 10. In the
      following table, the ?prefix? column is the international standard prefix
      for the appropriate power of ten; the ?binary? column lists jargon
      abbreviations and words for the corresponding power of 2. The B-suffixed
      forms are commonly used for byte quantities; the words ?meg? and ?gig? are
      nouns that may (but do not always) pluralize with ?s?.
  
  
      prefix   decimal   binary       pronunciation
      kilo-       k      K, KB,       kay
      mega-       M      M, MB, meg   meg
      giga-       G      G, GB, gig   gig,jig
  
      Confusingly, hackers often use K or M as though they were suffix or numeric
      multipliers rather than a prefix; thus ?2K dollars?, ?2M of disk space?.
      This is also true (though less commonly) of G.
  
      Note that the formal SI metric prefix for 1000 is ?k?; some use this
      strictly, reserving ?K? for multiplication by 1024 (KB is thus
      ?kilobytes?).
  
      K, M, and G used alone refer to quantities of bytes; thus, 64G is 64
      gigabytes and ?a K? is a kilobyte (compare mainstream use of ?a G? as short
      for ?a grand?, that is, $1000). Whether one pronounces ?gig? with hard or
      soft ?g? depends on what one thinks the proper pronunciation of ?giga-? is.
  
      Confusing 1000 and 1024 (or other powers of 2 and 10 close in magnitude) ?
      for example, describing a memory in units of 500K or 524K instead of 512K ?
      is a sure sign of the marketroid. One example of this: it is common to
      refer to the capacity of 3.5" floppies as ?1.44 MB? In fact, this is a
      completely bogus number. The correct size is 1440 KB, that is, 1440 *
      1024 = 1474560 bytes. So the ?mega? in ?1.44 MB? is compounded of two
      ?kilos?, one of which is 1024 and the other of which is 1000. The correct
      number of megabytes would of course be 1440 / 1024 = 1.40625. Alas, this
      fine point is probably lost on the world forever. [1993 update: hacker
      Morgan Burke has proposed, to general approval on Usenet, the following
      additional prefixes:
  
      +---------------+
      |groucho |10^-30|
      |--------+------|
      |harpo   |10^-27|
      |--------+------|
      |harpi   |10^27 |
      |--------+------|
      |grouchi |10^30 |
      +---------------+
  
      We observe that this would leave the prefixes zeppo-, gummo-, and chico-
      available for future expansion. Sadly, there is little immediate prospect
      that Mr. Burke's eminently sensible proposal will be ratified.]
  

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