An alphabetic system of inscribed notches for vowels and lines for consonants used to write Old Irish, chiefly on the edges of memorial stones, from the fifth to the early seventh century.

• 欧甘文字V形刻痕代表元音，线形刻痕代表辅音的字母系统。这一字母系统是用以书写古爱尔兰语的，在5世纪至7世纪早期主要刻在纪念石碑的边缘部分