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:
Latin-script alphabet
The 21-letter archaic Latin alphabet and the 23-letter classical Latin alphabet belong to the oldest of this group. The 26-letter ISO basic Latin alphabet, adopted the earlier ASCII alphabet (developed by standard organisations in the United States) and contains the 26 letters of the English alphabet, it in turn has been incorporated into more recent international standards that include additions to handle the other alphabets derived from the classical Latin alphabet.