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:
Old English Latin alphabet
In the year 1011, a writer named Byrhtferð ordered the Old English alphabet for numerological purposes. He listed the 24 letters of the Latin alphabet (including "et" ligature) first, then 5 additional English letters, starting with the Tironian note "ond" (⁊), resulting in a list of 29 symbols: