Objects that have absolutely no value for the player regardless of character build outside of being sold, and usually of sufficient monetary value to keep around specifically for that purpose. Usually things like jewellery, gems, and other trinkets.
The first video game about Vendor trash was released in 1994.
Nor is this case of obsoleted assets where items that once were useful to someone have lost their usefulness (because they still were useful).
In case these items are barely worth selling, use junk tag instead (which includes trash that can't even be sold because they're that useless).