Notable features included type of writing system: alphabet, number of letters: twenty-five which are grouped into five aicmí ( sing aicme = group, class) Each aicme is named after its first letter. It was an alphabet that appears on monumental inscriptions dated from the fourth to the sixth centuries AD within several manuscripts dating from the sixth to the ninth centuries. Ogham alphabet was inscribed on several stones within Ireland also the British Isles. The Irish were responsible for the present written format with spaces or symbols in use in the known world as the original Greek & Latin letters were written with continuous words.
Irish orthography has evolved over centuries.
