I am looking for something like an encyclopaedia of mathematics, but with the main difference from regular references of such kind being that one could use it to search for mathematical objects by entering in the mathematical notation of the object instead of, say, a common name using the usual symbols of a natural language. A quick example would be typing something like \mathbb R^3 into some engine and having it bring up a main, short article on euclidean $3$-space, with links to other articles dealing more with this object, etc.
My search so far has yielded only the usual kind of index or list, and I do really hope that someone has curated the kind of list I'm looking for.