What is "octagons"

Usage examples of "octagons".

There were octagons in Tempre and where Elcien had once stood and more than a score across Corus.

There was a curious ambivalence in his motions, of haste and reluctance, for his fingers caressed the sides of the octagons as he put them away.

That's why they have the little cubicles, though some of them turn into octagons by the time all the fixtures are installed.