Ragtag Daily Prompt: Thingamajig

Ragtag Daily Prompt finally has me stumped. What is this thingamajig?

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From left, GarGar, Pirouette and Maxwell.

Queen Pirouette adjusted the diadem on her head. As it was made of gold with precious gems, it was rather heavy and caused her neck to ache which in turn caused her head to ache. “I much prefer the tiara,” she said, looking askance at the mirror.

“You look beautiful,” said her husband, King GarGar. “That thingamajig on your head makes you look even more radiant!” Such was one of the secrets to their happy marriage. Neither of them was stingy with the compliments.