Is it a term for catholic schools or other institutions? I think maybe it is a school to teach priests. Maybe it teaches catholic teachers. It’s in the title of a picture The Salesianum in the Proximity of Milwaukee.
(That’s the one in Delaware, BTW, but I bet it always means the same thing.)
Pronounced “Sails” or Sallies?"
It’s pronounced as in ‘sails’ – the nickname for Salesianum High School in Delaware is Sallies, though. I usually have a handful of Sallies boys in my university classes every semester.
I went there for a history class when I was in my last year in high school, as my school (all girls) and Sallies (all boys) exchanged a few morning classes.
Who is this?
? If you mean who wrote what you’ve quoted, it’s me, Ms Boods. If you’re asking me to provide my real-life name on the message board though, I’d prefer not to do that. 
Uh, it was a joke Ms. Boods.
Go Raiders!
I’m interpreting that it’s just a term used by a specific group of Catholics to refer to any schools teaching their doctrine. Feel free to correct this if that’s wrong, but explain it better.
Thanks for the help people.
Not quite. The Salesianums is the (unfought-nickname, IIRC, rather than the actual) name of an order founded by Saint Francis of Sales and dedicated to teaching; by extension, a member of the order, worker in one of their schools, student of alumnus.
They don’t teach any specific doctrine; neither do Jesuits or Boschs, but of course the underlying philosophy of each Order leads to different teaching methods and so forth.
Not quite. ‘Salesianum’ refers specifically to the schools. The usual word in English for the various orders associated with de Sales - most of which were actually founded in the nineteenth century - is ‘Salesian’.