V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PPM
       Post Programmable Memory (Nokia)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PPM
       Pages Per Minute


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PPM
       Pulse Position Modulation (MMVF)


The Free On-line Dictionary of Computing (30 December 2018):

Portable Pixmap
PPM

    (PPM) A colour image file format.

   A PPM file contains the following:

    a two character "magic number" - "P3",
    the width in pixels,
    the height in pixels,
    the maximum colour component value,
    HEIGHT rows of WIDTH pixels.

   The rows are ordered from top to bottom with the pixels in
   each row ordered from left to right.  Each pixel is
   represented as three values for red, green, and blue.

   All parts are separated by whitespace and numbers are in
   decimal ASCIII representation.  A zero pixel component means
   that colour is absent.  Characters from a "#" to the next
   end-of-line are ignored and no line should be longer than 70
   characters.

   Here is an example of a small pixmap in this format:

    P3
    # feep.ppm
    4 4
    15
     0  0  0    0  0  0    0  0  0   15  0 15
     0  0  0    0 15  7    0  0  0    0  0  0
     0  0  0    0  0  0    0 15  7    0  0  0
    15  0 15    0  0  0    0  0  0    0  0  0

   A "RAWBITS" variant has magic number "P6", pixel values are
   stored as plain binary bytes, instead of ASCII decimal and no
   whitespace is allowed after a single whitespace character
   after the maximum colour component value which must be less
   than or equal to 255.

   (1998-02-06)