Irish alphabet - we used this to write in Irish. It was discontinued in the sixties but I chose to keep on using it until I put down my pen after finishing the Leaving Certificate Irish exam - have to say this was done with much relief - Irish is not an easy language to master and in those days if you failed Irish you would not get your certificate!
Ogham Stone. Ogham is an Early Medieval alphabet used primarily to write the Old Irish language, and the Brythonic language. Ogham is sometimes called the "Celtic Tree Alphabet", based on a high medieval Bríatharogam tradition ascribing names of trees to the individual letters. There are roughly 400 surviving ogham inscriptions on stone monuments throughout Ireland and western Britain; the bulk of them are in the south of Ireland, in Counties Kerry, Cork and Waterford.