Christopher Low wrote on Sep 27^th, 2011 at 10:34am:

Do you guys have a problem calling it a TriStar? I see so many people quoting "L1011", but I have always known the aircraft as a TriStar, and it is a much better designation than "L1011". On topic, I would love to see a TriStar, particularly the RAF  -500 version.

Well, at least in the industry, it was referred to as L-1011 most of the time; especially at Delta, their largest operator.