I know what it is, but I still can't help but think either "air raid siren" or "phonograph" seeing it.

"Back in my day when we wanted to increase the volume on the phonograph we didn't have none of them newfangled knobs or switches."

For those of you who aren't as knowledgeable as NWF Renim, this is part of a Type 22 General Purpose Radar

It's also presumably both Yukikaze's hair ornaments and also scaled appropriately to Yukikaze in human scale.