Yep, thats what it is, at least for non-dedicated hot-shoes. The PC flash connector is the same. The camera expects a positive voltage on the centre pin which it then connects to the outside of the shoe when the shutter fires.
If you're using a pi zero(w), I'd go for an old electonic (xenon) flash gun. Strip out the electronics (carefull of the capacitor) but keep the battery box, power switch and hotshoe connector. Add your pi zero and an apropriate boost/buck converter.
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