There's only 5 posts with it, you can remove them yourself.
Posted under General
see_through is for clothes, transparent could be for other more general things, like post #243297.
Updated
There's almost nothing in the transparent tag and unless someone wants to start populating it I'd recommend putting it all in see_through.
Or, if it's not clothing (which will only be a few), just tag it with both and if we decide to use transparent, it'll already be there for later.