I'm teaching myself Objective-C and I noticed in a lot of books and examples the use of 'k' and camel-casing in constant definition, e.g. 

#define kMyConstant 0

What is the significance of the 'k'? Is this unique to Objective-C style, or common to C in general? Why the deviation from (what I've always thought as a best practice) K_MY_CONSTANT style?

Thanks.

objective-c constants
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