What is ogham anyway?
The ogham alphabets are described in early Irish texts as cryptic codes as well as methods of writing, symbol sets used by the learned to communicate. Each of the twenty historical letters, in addition to its own sound, had a mesh of associations ranging from word-poems known as kennings to trees, birds, colors, fortresses, and many other meanings. There are also five additional letters, the forfeda, which were added to the system at a later date; not everyone works with these additional letters. It is possible that ogham was used mnemonically, enabling the bearers of an oral tradition to more easily memorize vast amounts of data and lore regarding their environment and culture. Many modern ogham workers have chosen one or just a few subsets of ogham to study, as the separate lists in and of themselves are not strongly correlated in meaning by letter. For example, R in the bird ogham may have a radically different meaning and symbolism than R in the color ogham. Trying to reconcile too