6 + 7 = 13. the 13 letter of the english lexicon is M. which stands for mango and mustard. what is M sideways? Σ. Σ also means sigma. sigma has 5 letters. you know what else have 5 letters? mango. 13 - 5 = 8. what else has 8 letters? low taper. it all makes sense now. this is a sign to revive low taper.