Terminology: What do you call those little thumbnails...

[Sam87hg 2]

What do you call those little thumbnails taken every few seconds of a video that are used for scrubbing through it during playback?

Not the poster, but all of those hundreds of little images that show up when you move over the progress bar during playback.

I want to ask a follow-up question about them and want to do it using the correct term to avoid confusion with other thumbnails, posters and whatnot.

Thanks!

[Luke 42078]

hi, those are called video preview thumbnails.

[Gilgamesh_48 1240]

37 minutes ago, Luke said:

hi, those are called video preview thumbnails.

Or they are called "the little pictures inside a bif file." 
I am sorry but i do not really like most of the names things get called. I'm not saying the naming is wrong or even poor it is just that many times what we call something does not really convey what is meant. In this case I believe "video preview thumbnails" is actually a pretty good name but it is just that so many things get named in such a way that the meaning is lost.

It is much like one definition of "poetry": "The art of obscuring meaning with language."