Well,
Mine has a dual meaning, OP as in Operation, and Hawk as in the Bird. to explain, when I was in the Navy, I stood a watch, operating an SSTG, Ships Service Turbine Generator, #4 to be exact. Operating is really not wholly correct, I Aligned Started and Placed in operation, then Circled It Like a Hawk waiting for the prey to falter, while the Electricians, actually operated it. The only thing I did was to record the engineering logs for the machine.
The second part, is in the pronouncing of it, if you separate it after the "O" PHAWK, instead of OP-Hawk, much easier to see.
Later
OPHAWK