English terms with diacritical marks
The Old English Latin alphabet began to replace the Runic alphabet in the 9th century, due to the influence of Celtic Christian missionaries to the Anglo-Saxon kingdoms. The orthography of Old English – which was entirely handwritten in its own time – was not well standardized, though it did not use all the Latin letters, and included several letters not present in the modern alphabet. When reprinted (on a printing press or computer) in modern times, an overdot is occasionally used with two Latin letters to differentiate sounds for the reader:
Boko alphabet
Boko (or bookoo) is a Latin-script alphabet used to write the Hausa language. The first boko was devised by Europeans in the early 19th century, and developed in the early 20th century by the British (mostly) and French colonial authorities. It was made the official Hausa alphabet in 1930. Since the 1950s boko has been the main alphabet for Hausa. Arabic script ("ajami") is now only used in Islamic schools and for Islamic literature. Since the 1980s, Nigerian boko has been based on the Pan-Nigerian alphabet.