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Someone claims to me that the hyphen in the word "Uh-oh" is a letter, not a punctuation mark, because it represents a phonological instruction (the glottal stop). Is this true? I have never heard of hyphen being a letter in under certain conditions, neither did I find anything like it when googling, but i might not be googling the correct terms.

Someone claims to me that the hyphen in the word "Uh-oh" is a letter, not a punctuation mark, because it represents a phonological instruction (the glottal stop). Is this true? I have never heard of hyphen being a letter in under certain conditions, neither did I find anything suggesting it can be when googling, but i might not be googling the correct terms.

Someone claims to me that the hyphen in the word "Uh-oh" is a letter, not a punctuation mark, because it represents a phonological instruction (the glottal stop). Is this true? I have never heard of hyphen being a letter in under certain conditions.

Someone claims to me that the hyphen in the word "Uh-oh" is a letter, not a punctuation mark, because it represents a phonological instruction (the glottal stop). Is this true? I have never heard of hyphen being a letter in under certain conditions, neither did I find anything like it when googling, but i might not be googling the correct terms.