Since the first entry in the series, the Ultima games made use of the Runic Alphabet on its maps and game manuals (see especially The Book of Mystic Wisdom from Ultima IV). Beginning with Ultima V, it was also used for many of the in-game signs, books, etc. This alphabet is especially present in Ultima V and Ultima VI, less so in Ultima VII and Ultima VII Part Two.
It is based on the Germanic / Norse runic alphabet.
High resolution image
Note that Q is missing. Q has its own symbol, but it's not on the chart above. Note also that this is BASED on Nordic Runes. Not the actual Runes used in Nordic writing.