Came across this while looking up some information for Chinese dialects.

What do the question marks mean as an IPA symbol?
Came across this while looking up some information for Chinese dialects.

What do the question marks mean as an IPA symbol?
The IPA symbol that is similar to a question mark is the glottal stop symbol, which indicates the glottal stop phone, a sound made by completely obstructing and then releasing airflow at the glottis. This sound occurs as a phoneme in many languages and is very common as an allophone and/or articulatory artefact in most. In san serif fonts the glottal stop symbol may appear identical to a question mark but without the dot below [ʔ], or have a horizontal serif at the base as in the following:
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According to Pullum and Ladusaw (1986, p185) the glottal stop symbol does originally derive from the use of the actual question mark symbol to indicate a glottal stop.