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traig [Old Irish]

In Ireland, a unit of length = half a step, 1¼ feet.

sources

troig gu ceathraimthe troiged, uair da traigid gu leith, 's-e in ceim inraic.

1¼ feet, half of a normal step, which was 2½ feet.
(or) the step of a foot and a quarter of a foot, for the lawful step is two feet and a half.

Ireland. Commissioners for Publishing the Ancient Laws and Institutes of Ireland.
Ancient Laws of Ireland, volume IV.
pages 214 and 215. See also vol VI, Glossary, page 745.
Dublin: Printed for His Majesty's Stationery Office, 1901.