Asymbol that represents a speech sound and is a unit of an alphabet?

I would say a letter as it represents a speech sound and is part of an alphabet. For example the letter "u" can be a 'you' sound or an 'uh' sound depending on whether it is in a word like "universal"  or in say  the word "but"

Explanation:

That is still k. The speech noise k is in the elements written ask but in the phonetic alphabet, according to the IPA, it is still k. Spelling a letter based on the alphabet and writing it in the universal phonetic characters is often another, but for it is equal.

lemme see i dont think i know that one h

sufficient and relevant

explanation: