Elucidation: It is A temporal region that is without extent. Zero-dimensional temporal regions, also called temporal instants, are the temporal regions in which process boundaries are located. Example of usage: the moment at which a child is born; the moment at which a finger is detached in an industrial accident; a temporal region that is occupied by a process boundary; right now; the moment of death. Source: Robert Arp, Barry Smith, and Andrew D. Spear: Building Ontologies with Basic Formal Ontology. The MIT Press Cambridge, Massachusetts London, England. ©2015 Massachusetts Institute of Technology. ISBN 978-0-262-52781-1, Glossary. https://www.ebi.ac.uk/ols4/ontologies/bfo/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FBFO_0000148