Apparently I’m in a language-chart-making mood. This time, though, the nerdiness quotient jumps dramatically, with an Ogham alphabet chart. Ogham is a medieval alphabet used for Primitive Irish and Old Irish and a few other languages. Very obscure, but also very cool, as you can see:

It can be written both vertically and horizontally. The red letters are the transliteration (according to manuscript tradition), the grey letters in brackets are the pronunciation, and the italicized words are the names of the letters. Some of the forfeda (the last group) changed meanings over the course of time, so I’ve included both. (I haven’t included pronunciations for the forfeda, though, mostly because none of my source materials did and I didn’t want to assign incorrect values.)