.I assign tag:!Archive to notes
To "remove its reference from search", use -tag:!Archive
I also use a x prefix on notebooks, tags, titles, ...
They are not removed from lists but sort alphabetically to the bottom and can be more easily ignored.
edit: As pointed out, this is a work-around to achieve archiving. Evernote hasn't implemented an archiving solution; hense the above request.
To indicate your support for the request use the voting buttons in the top left corner of the discussion
To archive your data try the work-arounds presented in this discussion