Topic summary
Tip of the hat
Extracted from the Wikipedia article Hat tip.
Metaphor
In 1929, syndicated cartoonist Jimmy Hatlo started thanking readers who suggested a funny idea for a strip with the phrase "Thanx and a tip of the Hatlo hat to [name]" at the bottom of his comic strip panel They'll Do It Every Time. He continued drawing the hat tip box in the strip until his death in 1963.