[bnastic]

Or if you work in trading, IOC made it a very confusing title

[CaptainOfCoit]

I'm a programmer, designer and architect, so my mind immediately went to "Inversion of Control"

[misnome]

Or Input/Output Controller (scientific facility control layer tech)

[Ntrails]

It is delightful how acronyms close to you embed deeply and can cause little shocks vs the rest of the world.