I love the English language. It's so delightfully ambiguous.
Question of the day: What is the correct abbreviation of "microphone"?
I have become accustomed to using "mic." I don't know why. I don't know when I picked it up. I imagine it's because of my music background. Apparently, this is the version most used by musicians and technicians in the industry.
But if you look at other words as precedent, why then you have "bicycle" reduced to "bike" and "tricycle" reduced to "trike." So many people use "mike."
More complications result when use of the word changes from noun to verb. When you are setting up a microphone for the drums, for instance, are you "micing the drums" or "miking the drums"?
Personally, I don't mind a little mix and match: mic, miking, miked.
But this was enough to send one linguist into a rant on the subject. He also happens to link to a poetry site where the question was posed to poets at large. Their responses are varied and entertaining.
So which do you use: mic or mike?