# Subscripts in the titles of questions?

How did they get subscripts in the title of this question? It's like Latex in the title without Latex in the title! It would greatly beautify our titles if we could do this for all questions, especially if it doesn't interfere with search results.

While Unicode sub- and superscripts are certainly a way to include it in the question titles, it has a couple of flaws, as pointed out by Nicolau, jonsca and Manish. The only advantages I can see is, that they reduce the occurrences of ce in the url and the display of the title in the search engines.
I personally prefer using trivial/ common names wherever possible, i.e. substitute $\ce{H2O}$ with water. For the given example, lead (IV) chloride would probably lead to better results in searches.