``Instant'' and ``moment'' invite confusion between a point in the continuous model and a nondecomposable unit in the discrete model (-E8). Clocking instruments invariably report the occurrence of events in terms of time intervals, not time ``points.'' Hence, events, even so-called ``instantaneous'' events, can best be measured as having occurred during an interval (-E9). ``Time quantum'' is precise, but is longer and more technical than ``chronon'' (-E2). ``Time unit'' is perhaps less precise (-E9).