Answer: oghams

AnswerCrossword Clue
OGHAMSCharacters of early Irish alphabet.
OGHAMSLetters in an Irish alphabet
oghamsinscription employing this script
oghamsOGHAM, an ancient alphabet, also OGAM
oghamsany of the 20 characters of this script, each consisting of one or more strokes for consonants and of notches for vowels cut across or upon a central line on a stone or piece of wood
oghamsalphabetical script used originally for inscriptions in an archaic form of Irish, from about the 5th to the 10th centuries