When did the modern English alphabet develop?
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:
Swedish Dialect Alphabet
The Swedish Dialect Alphabet () is a phonetic alphabet created in 1878 by Johan August Lundell and used for the narrow transcription of Swedish dialects. The initial version of the alphabet consisted of 89 letters, 42 of which came from the phonetic alphabet proposed by Carl Jakob Sundevall. It has since grown to over 200 letters. The alphabet supplemented Latin letters with symbols adapted from a range of alphabets, including modified forms of þ and ð from Germanic alphabets, γ and φ from the Greek alphabet and ы from the Cyrillic alphabet, and extended with systematic decorations. There are also a number of diacritics representing prosodic features.