That's the fun thing about some of the older systems. Program names were limited to eight or ten characters so you had to get creative with naming within a library (basically the equal of a folder on AS/360 ... AS/400 systems) if it got large.
We have a few systems with data from the 90s that carried over the 8 character limit and a few older devs who are still in the habit of shortening names. Everyone once in a while I have to remind them to spell things out, they aren't being charged by the letter!