What does the acronym DDI stand for when Xcode emit "Checking DDI symbol" when building?

Question

Please provide link(s) to authoritative sources (e.g. Apple, etc). Thanks.

Answer 1

I guess "device driver interface".

Take a look at the script:

/Developer/Platforms/iPhoneOS.platform/Developer/Library/PrivateFrameworks/DTDeviceKit.framework/Versions/A/Resources/sync_ddi 

Answer 2

IMHO @MacMark's answer is wrong.

DDI probably stands for Developer Disk Image.

Answer 3

Device Driver Interface (DDI)

Telecommunication Networks Group

List of Technology Acronyms