doubloon

noun

Etymology: From French doublon, from Spanish doblón, augmentative of doble (“double”), because it was worth twice a pistole.

1. A former Spanish gold coin, also used in its American colonies.

   “English, French, Spanish, Portuguese, Georges, and Louises, doubloons and double guineas and moidores and sequins, the pictures of all the kings of Europe for the last hundred years, strange Oriental pieces stamped with what looked like wisps of string or bits of spider's web, round pieces and square pieces, and pieces bored through the middle, as if to ware them round your neck – nearly every variety of money in the world must, I think, have found a place in that collection...”

2. Clipping of doubloonie.
3. Alternative form of dabloon (“fictional currency”).