1. As a written communication:
* Письмо (pis'mo) - This is the most common translation and refers to a written message, especially a personal one.
2. As a single character in an alphabet:
* Буква (bukva) - This refers to a letter in the alphabet, like the letter "A" or "B".
3. As a part of a word:
* Буква (bukva) - This is also used when referring to a single letter within a word.
Example:
* "I received a letter from my friend" - "Я получил письмо от друга" (Ya poluchil pis'mo ot druga)
* "The letter "A" is the first in the alphabet" - "Буква "А" - первая в алфавите" (Bukva "A" - pervaya v alfavite)
* "The word "hello" has five letters" - "В слове "привет" пять букв" (V slove "privet" pyat' bukva)
It's important to consider the context to choose the right translation.