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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   picture element
   pixel
      <graphics> (pixel) The smallest resolvable rectangular area of
      an image, either on a screen or stored in memory.  Each
      pixel in a monochrome image has its own brightness, from 0
      for black to the maximum value (e.g. 255 for an eight-bit
      pixel) for white.  In a colour image, each pixel has its own
      brightness and colour, usually represented as a triple of red,
      green and blue intensities (see RGB).
      Compare voxel.
      (1998-05-08)