What to call a top level "multiple images per image" tag?

Images with multiple images mess up pretty much any searches that require “solo” to mean that only one character is shown. Rather than having to list any and all subset of “images that have multiple images”, we should probably have one master tag to rule them all to be implied by such tags and to make searches easier.
 
Some tags that should imply this:  
reference sheet  

 
facial expressions (yes the name is terrible and I started a topic on it)  

 
transformation sequence  

 
collage  

 
meta mosaic  

 
sketch dump  

But, is the distinction really needed? Besides, it can get really murky when a “single image” is made to have multiple scenes but those scenes are arranged or integrated in a way that’s not separable/part of the whole composition. Like, um… …I can’t find an example at the moment. But you know what I mean!
 

 
For your consideration, there are the extremely underused multiple images and multiple pictures
 

 
There are also diptych, triptych, multiple angles, all in one, comparison, turnaround (when not used on animations), montage (whe not used on animations), compilation (when not used on animations), juxtaposition (but only sometimes because that also gets tagged on single images that are involved in a meta-juxtaposition)…
 
…innumerable memes that depend on it, like hotline bling, shirt cut meme, doing hurtful/not doing hurtful/doing loving things (to your waifu), upgrade meme, etc. etc. etc…
 
…and, from a certain point of view, comic
 
@saby  

It doesn’t always, though - like, right now on the first page of results, there are  
 
and others, that are a single drawing.
 

Not always - it gets tagged on separated images which are parts of a sequence. Oh, and there are also sequence and progression (when not animated) which are similarly often-but-not-always made of several images, as well as weight gain sequence and vore sequence

@Background Pony #68DF  
re: transformation sequence singles  
that is flat mistagging though, on the basis that images should not be tagged for content that is not on them
 
such cases should probably only have “weight gain” and “part of a set”

@saby
Is it REALLY an issue that solo is tagged on those kinds of images?

@LightningBolt
It wouldn’t be, if there was an even halfway usable way to unselect them when you’re trying to get only true solo pictures. But there isn’t.

Bumping this up again because I’m doing a little tagging on king-kakapo’s art which contain a lot of posts where what would otherwise be “alternate version”s are appended into one file.

So, I’m walking that back, I’d tag it when I see it if there was an approved tag to represent it.

I’ve also come across multiple views, combined images, and alternate versions

“multiple angles” and “multiple views” could probably be merged, although they presently seem slightly differentiated by being “full images from different viewpoints” and “inset or partial images from different viewpoints”, respectively.