[CentOS] mystery process "unit"

Ok, dumb question. On a certain LAMP server I am seeing in 'ps auxf' a process 
called "unit" with no arguments or other path info. It has a fairly low pid, 
3041, indicating it might have been started soon after reboot (last week). 
but ps says it was started yesterday,

I don't see it on any of 3 other CentOS machines. It is hard to google for 
such a generic name. So does anyone either know what it is, or how I can find 
out more about it?

Sam