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

ATA point
Anglo-Saxon 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)