Crossword clues for the word: PLUSSIGN The word PLUSSIGN has appeared as an answer to at least 10 crossword clues on different crossword puzzles. Crossword clues for PLUSSIGN Showing 1 to 10 of 10 results Clue(s) A little cross? Arithmetical symbol. Formula symbol. Grade school operator Ion indicator Ion symbol L.G.B.T.Q.I.A. follower One of five depicted in this puzzle Sum thing? Summer symbol?