It's Dzus, which is, of course, pronounced 'Zeus' as in the Greek God. They were all over military aircraft from the 50's onwards and work great when they're new. Trouble is that they wear out really quickly - the wire that the 'screw' twists into bends and then they tend to look and feel secure but rattle open under stress. We had more than one panel drop off Jaguars (Sepecat, not JLR) through worn out Dzus fasteners that weren't secure.
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