A singular location, locus or position; e.g. an exact time on a timeline. A mathematical point has no extension. An isolated electron approaches being a ‘point charge’. Positions in geometric arrangements (e.g. a crystal lattice) are points. The intersection of an artificial horizon or computed boundary and a trajectory may be a ‘point of no return’, or a decision point in a search pattern. An abrupt transition is a point, e.g. a boiling point. Some structures are ‘pointed’, e.g. a thorn. [There are cognitive analogues to the points made here commencing with the use of the index finger by infants.]
