also: ハテナマーク
Refers to the punctuation mark '?'. Used in everyday contexts, including computing and writing.
文の終わりにはてなマークを付けてください。
Please put a question mark at the end of the sentence.
はてなマーク is the full, slightly more formal term for the '?' symbol, while はて(な) is its casual, abbreviated form.
はてなマーク is a colloquial, child-friendly way to say '?' mark, whereas 疑問符 is the formal, technical term used in linguistics and writing.
From はてな (an interjection expressing doubt or questioning) + マーク (mark). The exact origin of はてな is uncertain, but it likely derives from the classical Japanese interrogative particle は and the particle てな.