:t
Of a path, keep the file name: a two-letter basename.
The mirror of :h: it drops everything up to the last slash and keeps just the file name, like basename.
Handy right after downloading or copying something with a long path: the file now sits right beside you, and :t calls it by first name.
$ scp estufa:/var/coletas/prensa-final.pdf .
$ open !:1:t
open prensa-final.pdf