Ogham

Ogham or Ogam (Gaelic) is an Irish manner of writing that involves scratching lines on a surface, commonly around the corner of a piece of stone or wood, though ogham manuscripts also existed up to the 16th century. The lines represented its own alphabet and the 25 letters were distinguished by the number of lines and whether they were left or right of the corner or centreline.

It has not been clearly established whether there existed a period ogham sign language.

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