For those who aren't aware, the little cross (+) before a last name is how bishops were respectfully referred to at the Winona Seminary. The rector (+Williamson) was often abbreviated +W -- including by +W himself!
So in case anyone was wondering, it's as respectful to type +Zendejas, +Faure, or +Fellay as it is to type out "Bishop Zendejas", "His Excellency Bishop Zendejas", etc. It just saves typing time. Just like typing "Fr." is just as respectful as "Father" or "Reverend Father".
I don't know where the custom came from, but to throw out a guess, perhaps the + represents the pectoral cross a bishop wears?
I will admit though, the + (plus) symbol certainly doesn't do any favors in the search engine department. People might search for "bishop zendejas" or "bp. zendejas" and Google will index those things, but all symbols are pretty much stripped out -- on both ends (Google's massive database/index of all websites, as well as the search text you type in)