Although most trailers advertise a single movie, studios occasionally combine shorter versions of two different trailers into a single trailer that advertises the two separate movies. In the past, studios have tried to use file names like:
Tron-2-Oceans_Combo-TLR-1 to indicate the two titles and the “combo” nature of the trailer. Obviously length issues and clarity of film name were problems.
For a while, the recommended way to label combo trailers was to use the “+” symbol between the words that denote each title.
Some servers had trouble with the + symbol however, so the new recommendation is to use all CAPS for the title of each film and insert a lower case “n” between the titles.
The lower case “n” indicates that the trailer is a combo. Nowhere in the name does the word “combo” need to appear