What is "decagons"

Usage examples of "decagons".

In the next, a true oddity, reading matter caught not in the facets of decagons but on supple wry-grass paper, lovingly handmade, bound with cor-tail thread, surrounded by covers fashioned from the speckled hides of razor-raptors, dyed hin-demuth, pebbled searay, even, astonishingly, perwillon.

Out of this fountained twenty-four small decagons, twelve each of red and black, suspended in the beam of the light, while the two contestants put their left hands into the edge of the holographic spiral.