Source : Free On-Line Dictionary of Computing

ATA point
     
         (Or "Anglo-Saxon point") One of the two most
        common variants of the {point}, equal to 0.3514598 mm, or
        0.0138366 inch, or 1/72.272 inch.  The ATA point is used on
        the island of the United Kingdom and on the American
        continent.
     
        [What point do they use in Ireland?]
     
        (2002-03-11)