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:
Africa Alphabet
The Africa Alphabet (also International African Alphabet or IAI alphabet) was developed by the International Institute of African Languages and Cultures in 1928, with the help of some Africans led by Diedrich Hermann Westermann, who served as director of the organization from 1926 until 1939. Meanwhile, the aim of the International Institute of African Languages and Cultures, later known as International African Institute (IAI), was to enable people to write all the African languages for practical and scientific purposes without the need of diacritics. It is based on the International Phonetic Alphabet with a few differences, such as "j" and "y", which instead have the same (consonant) sound values as in English.