
The Forfeda are the `additional` letters of the Ogham alphabet, beyond the basic inventory of twenty signs. The most important of these are five forfeda which were arranged in their own aicme or class, and were invented in the Old Irish period, several centuries after the peak of Ogham usage. They appear to have represented sounds felt to be mis.....
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http://en.wikipedia.org/wiki/Forfeda

(from the article `ogham writing`) ...of from one to five strokes, thus giving 20 letters. These were incised along the edge of a stone, often vertically or from right to left. A fifth ...
Found on
http://www.britannica.com/eb/a-z/f/47
No exact match found.