Its the ghost of the "Display Menu" .app that was removed previously
I know this because I just removed mine and did everything I could to remove any trace of it but I dunno how to get rid of it. It is all post boot so I guess it doesnt affect boot issues. Oh well.... it was a great app except OSX always said it was damaged.
There are also several other places to check for startup items incl: under lib starupitems folder, and launchagents and launchdaemons folders. Look in both root lib and you users lib as well.