[smnscu]

I think you might be referring to this https://en.wikipedia.org/wiki/Flick_(time)

[tyingq]

Also, somewhat related, the "TU" https://en.m.wikipedia.org/wiki/TU_(Time_Unit)

[jedimastert]

That's it! Thank you very much.

I searched around on Wikipedia for it and couldn't find it. I might recommend some edits when I have the time.