Add another regular Hadamard to the three legged one to get an AND gate on computational basis states:

In general it's this bunch of symbols:

Yeah I'm mostly joking, I agree with providing circuit diagrams - but if you're having to make up new notation anyway...

Hadamard box is "all ones matrix except for the bottom corner", e.g.:

Or we could all use the ZX-calculus!

Cinema-goers agree that the proof technique is unsatisfying:

New proof technique unlocked:

More fun footnotes in papers please! On 'copy cup' gates (scirate.com/arxiv/2410.1...):

Noice bit of whimsy from Hinze and Marsden: 'In addition to the ear, we meet two old acquaintances, the doughnut and the hourglass... and we get to know a new one, the “spiral.” All of them share the fate of the ears in that they collapse to the identity.'

Alternatively: the ZX-calculus representation is the best way of depicting surface codes (arxiv.org/abs/2204.14038)