There is this tag, hadamard-product; as can be seen e. g. on the Wikipedia disambiguation page, it can have four different meanings. I for one, attracted by it in a recent question (I badly need to simplify Hadamard products of certain series) discovered that it is about the Hadamard product of matrices, which is (an also interesting but) entirely different thing.

I don't know, does it make sense to split such tags? To introduce some disambiguation-like device à la Wikipedia would be sort of overkill I believe...

Previously, there was discussion in What "lattices" do we need? that resulted, I believe, in introducing lattice-theory and leaving lattices. I understand this is not ideal but cannot think myself about any better solution. With Hadamard products, it is even worse. hadamard-product-of-series and hadamard-product-of-matrices look clumsy, and there still are other two meanings!