Definition of “question mark” - English Dictionary

“question mark” in American English

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question marknoun [ C ]

us /ˈkwes·tʃən ˌmɑrk/

a symbol (?) used in writing at the end of a word or group of words to show that it is a question

(Definition of “question mark” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“question mark” in Business English

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question marknoun

uk us

[ C, usually singular ] a feeling of doubt about something:

a question mark over/about sth There is a big question mark over people's willingness to invest in this scheme.
The biggest question mark hanging over China's exports lies in the currency exchange rate.

[ C ] MARKETING a product or company that has a small share of a market that is growing very fast:

If nothing is done to change the market share, question marks will just absorb large amounts of cash.
See also

(Definition of “question mark” from the Cambridge Business English Dictionary © Cambridge University Press)