hat tip
US /ˈhæt tɪp/
UK /ˈhæt tɪp/

1.
an acknowledgment of a source of information or inspiration, often used in online contexts to credit someone for sharing something interesting or useful
:
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A big hat tip to John for sharing that insightful article.
•
I'd like to give a hat tip to the original researcher for their groundbreaking work.