Negation symbol, in logic (5)
I believe the answer is:
tilde
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">negation symbol in logic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tilde that I've seen before include "Style detail" , "Accent (used over n) in Spanish and Portuguese" , "Significant mark" , "Mark placed over N in Spanish" , "Mark, sometimes on keyboards" .)