Celtic and Pictish - early Celts and their priests, the Druids, had their own form of alphabet known as “Ogam Bethluisnion”, which was an extremely simple alphabet used more for carving into wood and stone, than for general writing, while Pictish artwork was later adopted by the Celts, especially throughout Ireland
The Ogham. ( pronounced OH-am or OH-yam ) , is also know as the Druid's Alphabet. The letters correspond to their 20 sacred trees. The 25-letter alphabet was supposedly inspired by Ogma, god of eloquence. The letters are strung together along a central line, either vertically or horizontally, in which case the letters are rotated.
'The Awen' - Celtic/Druidic symbol in the center of the triple moon and sun. Awen is a Welsh word for "(poetic) inspiration". In the Welsh tradition, Awen is the inspiration of the poet bards; or, in its personification, Awen is the inspirational muse of creative artists in general: the inspired individual (often, but not limited to being, a a poet or a soothsayer) is described as an awenydd.