Stars and bars
I seem to recall that in the mid 1990s (possibly later, but when they still had 742s and 743s), AI had a lengthy FE's dispute because they wanted to have three bars rather than two. Ran on for quite a while.
On certain carriers, CX for one, there are "half bars", with the result that a junior FO has two and a half stripes (much like a naval Lt Commander) and then, SFOs have three. I think LH have something similar.