Assertion: abacus | /r/CapableOf | call apex
Facets:
Source sentences:
text: The abacus that Gerbert reintroduced into Europe had its length divided into 27 parts with 9 number jetons, so called apices (this would exclude zero, which was represented by an empty column) and 1000 apices in all, crafted out of animal horn by a shieldmaker of Rheims.