Igamm is a Word Notation system.
Vusamazulu Credo Mutwa – Zulu Shaman [Dreams, Prophecies and Mysteries]
....the languages and customs of the Celtic people have very many similarities to those all over Africa.
The Celts had a form of writing with marks or notches, which they called Ogham, which is very similar to our traditional writing, which also consists of notches, and which we call coolu or igamm in Zulu.
Even to this day Zulus call a written letter, a letter like 'a' or the letter 'b' – 'igam' and the word igam is very close to the Celtic Iberian word 'Ogham'.
For iPad/iPhone users: tap letter twice to get list of items.