I thought about using ‘synchronicity’ as a substitute term for coincidence, but I reject Jung’s godless inference in them and what it has come to mean. So ‘co-instants’ and ‘co-instance(s)’ are pretty straightforward and intuitive, meaning ‘not a chance!’ ; - ) I’ve been keeping a Co-instants Log for nearly forty years now with retrospective entries for almost three decades prior.
A one-off coincidence does not necessarily make it into the log, but sets of connected ones with obvious meaning linking otherwise separate and disjoint events certainly do. And multiple ones are impressive (some recounted here, in case you haven’t seen it).