Answer: oghamic

AnswerCrossword Clue
OGHAMICLike Old Irish lettering
oghamicpertaining to an ogham (an ancient alphabet, also OGAM)
oghamicthe alphabetic system of fifth and sixth century Irish in which an alphabet of 20 letters is represented by notches for vowels and lines for consonants and which is known principally from inscriptions cut on the edges of rough standing tombstones