What is saighdi?

Some articles on saighdi:

Private (rank) - Europe and Latin America - Ireland
... Private (Pte) (saighdiúr singil in Irish), is the lowest enlisted rank in the Irish Army ... (rather than promoted) from recruit to private 2 star (Pte 2*) (saighdiúr singil, 2 réalta) ... (usually lasting eight weeks) the soldier is upgraded to private 3 star (Pte 3*) (saighdiúr singil, 3 réalta) ...