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:
Standard Alphabet by Lepsius
The Standard Alphabet is a Latin-script alphabet developed by Karl Richard Lepsius. Lepsius initially used it to transcribe Egyptian hieroglyphs and extended it to write African languages, published in 1854 and 1855, and in a revised edition in 1863. The alphabet was comprehensive but was not used much as it contained a lot of diacritic marks and was difficult to read and typeset at that time. It was, however, influential in later projects such as Ellis's Paleotype, and diacritics such as the acute accent for palatalization, under-dot for retroflex, underline for Arabic emphatics, and the click letters continue in modern use.