Eight characters with diacritics are included in International Morse Code: Ä, Á, Å, Ch (a Czech digraph), É, Ñ, Ö, and Ü. This encoding method, which includes only capital letters, was developed by Friedrich Clemens Gerke in 1848 and was adopted as an international standard in 1865. | Eight characters with diacritics are included in International Morse Code: Ä, Á, Å, Ch (a Czech digraph), É, Ñ, Ö, and Ü. This encoding method, which includes only capital letters, was developed by Friedrich Clemens Gerke in 1848 and was adopted as an international standard in 1865. |