When I go to add the symbol of minus (<) in the dropdown published label, then after saving that symbol "<" id being deleted from sugarcrm, with the opposite symbol instead (>) it works all well.
Are you trying to include the "<" (less than) symbol in a label for a field or as a front-end value in a dropdown?
I got it to work by editing the language file and adding the html entity < at the front of the label.
It won't work, however, if you try to add that entity via Studio.
So I'm not sure what kinds of trouble you'll get yourself into by forcing it in the file.
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