F, as the sixth letter in the Latin alphabet, comes from the combination FH and stands for the sound value /f/. This letter was invented by Etruscans in Etruscan.
The pronunciation of f is the same as that of /w/ in Greek (and the letter named Digamma disappears in Greek because this phoneme disappears in Greek). The prototype of F is the letter W,&; Acircw, it also attacked /w/, which may provide a clue.
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In ancient China, Chinese characters were used as the carrier, and they were annotated by methods such as orthography and anticlockwise. Direct pronunciation uses homophones to express the pronunciation of Chinese characters. If homophones are uncommon words, they can't be read even if they are pronounced.
Backcutting uses two Chinese characters to mark another Chinese character, the upper word is the same as the initial consonant of the marked word, and the lower word is the same as the vowel and tone of the marked word. Mr. Zhou Youguang called reverse cutting "center cutting welding method".
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