HTML entities for math

Because of this blog, I often find myself looking up the HTML entities for mathematical symbols. The primitive software that runs this blog apparently can't handle most mathematical symbols, so I'm often stuck looking up the HTML codes and entering them by hand. Because of this, I'm probably one of few people in the world who knows that the code for the Weierstrass ℘-function is ℘, for example.

I recently came across an HTML code that I found somewhat entertaining. The code for ∈ is ∈, which makes a certain degree of sense. Probably by analogy to this code, the code for ∋ is ∋, which is probably meant to be "in" backwards. On the other hand, I have no trouble at all imagining people at some standards meeting walking around saying "Ni!" and making jokes about shrubberies when this was being discussed.

After thinking about it for a minute or two, I'm now fairly sure that's what happened.