Letter frequency xz. Modern International Morse code (generally believed to have been developed by Alfred Vail based on English-language letter frequencies of the 1830s) encodes the most frequent letters with the shortest symbols; arranging the Morse alphabet into groups of letters that require equal amounts of time to transmit, and then sorting these groups in increasing order, yields e it san hurdm wgvlfbk opxcz jyq. Similar ideas are used in modern data-compression techniques such as Huffman coding. Letter frequency was used by other telegraph systems, such as the Murray Code. Letter frequencies, like word frequencies, tend to vary, both by writer and
Morse code for non-Latin alphabets not have a Morse equivalent, with Е used instead. Hebrew letters are mostly represented using the Morse representation of a similar-sounding Latin letter (e.g. "Bet" ב≡B); however the representation for several letters are from a Latin letter with a similar shape (e.g. "Tet" ט ≡U, while "Tav" ת≡T). See also The following telegraph code table is adapted from one given by Ashok Kelkar, where the Latin letters are encoded as per the International Morse code standard. Some variations on this code exist, and there have been some attempts to introduce other telegraph codes to add efficiency and make it suitable