Sounds are noises produced, and in the context of language, they usually are connected to some certain letter or the combination of them. Symbols are representations of concept or idea, created in a cultural context. Letters are signs that represent the written components of sounds and language.

Explanation:

The sound refers to the produced noise that is audible. In the context of the language, it is the tone we make and that comes from our mouths, meaning the oral language. Some languages do not have a written alphabet, but all languages are oral and consist of producing sound. One sound can be equal to one letter, but some letters stand for two sounds or sounds that should be made after a combined mixture of two or more letters.

The symbol is a character or glyph that humans recognize to be a representation of some idea or concept. These are usually things that are known matter in a certain society. They don’t have to have a natural, biological connection to their representation, but we understand them to be the impression of some idea.

Letters in alphabets are symbols of the language and certain sounds. Each written letter of the alphabet stands for some sound and represents a certain character used in oral and written communication.

It is important to note that while letters are, at their core, a symbol, not all written symbols are letters. Also, while sounds can represent language and have the written equivalent in the form of a letter, not all sounds represent letters. 

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