pointlike
Adjective
Meaning
Resembling a point
(physics) Having dimensions too small to be measured, or so small that it may be regarded as a point
Source: en.wiktionary.orgExamples
The calculation assumes that the quarks behave like pointlike Dirac particles, each having their own magnetic moment.
This was established by Einstein, Infeld, and Hoffmann for pointlike objects without angular momentum, and by Roy Kerr for spinning objects.