(Latin: letter; a graphic symbol, a written character, an alphabetic sign)

transliteration (s) (noun), transliterations (pl)
The act or results of representing letters or words in the characters of another alphabet, language, or script: Sam was unable to talk clearly, so he was using transliteration to communicate with others by producing his conversations in a sign language, and his friends were doing the same with him.
transliterator (s) (noun), transliterators (pl)
Someone who can translate or write words or letters in the characters or alphabet of another language: For the essay she had to write for one of her classes, Edith needed a transliterator to transcribe the text in Japanese into English so that she could understand it!