I had always wanted to know this, and seing one of the two again tonight reminded me of the question.
I assume that these two stickers are together, or at least rival each other. Both are square.
1.One of the stickers is Blue with a Yellow Equal sign on it.
2.The other one is Black with a Blue Minus sign on it.
What do these mean, and along with that, are they indeed opposites to each other or what? Are there more in this group if they are so grouped?