Use reasoning to lead to the answer of the following question:
What do you use to pronounce parts of a letter?\nOptions:\n- joke\n- word\n- number\n- syllable\n- english alphabet

syllable
Syllable is a unit of pronunciation having one vowel sound, with or without surrounding consonants, forming the whole or a part of a word.

We used to pronounce syllable for the parts of a letter.

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The final answer: syllable