P.O.D.

   [rare;  sometimes  `POD'  without  the periods] Acronym for `Piece Of
   Data' or `Plain Old Data' (as opposed to a code section, or a section
   containing  mixed  code and data). The latter expansion was in use by
   the C++ standards committee, for which it indicated a struct or class
   which  only contains data (as in C), distinguished from one which has
   a constructor and member functions. There are things which you can do
   with a P.O.D. which you can't with a more general class.

[glossary]