Letter SVG is a separate symbol of any alphabet, grapheme, monograph.
Most often the letter corresponds to the sound in oral speech, but it is not necessary (for example: ъ – in Russian or r in British English).
A letter may have several equivalent spelling variants that do not change its pronunciation and meaning.
The number of letters in the alphabet usually does not exceed 50, but there are exceptions (for example, the Khmer alphabet).
Some mathematical symbols, actions and functions are formed by letters of different languages, for example: sinus (combination of Latin letters), delta (from the ancient Greek alphabet), alef (from the Jewish alphabet).