About Irish letters
Modern Irish needs only the síneadh fada, the acute accent on á, é, í, ó, ú. Traditional Gaelic type used a dot above consonants for lenition, now written as h.
The Irish layout on Windows types the fada with Alt Gr plus the vowel; the UK layout needs the UK Extended variant.
On a Mac, Option+E then the vowel gives the fada on any layout.
Irish letters: names and codes
Every special letter in Irish, with the Windows Alt code where one exists, the hex code to type in Word followed by Alt+X, the Mac shortcut and the HTML entity. Click a letter to copy it.