The term is sustain no 's', and The Edge (oh how I bristle with names that start with "The"...) has been doing that delay/sustain/echo/reverb thing since they started in '79.
I was being a bit facetiously vague knowing that song unfortunately all too well and some of their other pallid stuff that followed their formative years.
It was to add to JR8's perspective on how bands some change and loose their mojo along the way, and, my point of how many of those who know those tired pop tunes may not even know their good stuff (subjective disclaimer) from Boy and October.
Same goes for INXS, what a damn good album Shaboo Shabaa was.
Like this I Will Follow https://www.youtube.com/watch?v=g2BqLlVHlWA if you can get past Bono's ridiculous dancing. Hey, it was the 80s.
I wouldn't have noticed it if you hadn't have mentioned it.
