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This question already has an answer here:

What is the origin of the letter d in dmesg?

Wikipedia says:

dmesg (display message or driver message)

No reference are given for this assertion - it could just as well be "debug message".

What is the etymology of dmesg?

marked as duplicate by Satō Katsura, Kusalananda, Michael Homer, Stephen Kitt, Community Jan 28 '17 at 10:51

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No reference are given for this assertion - it could just as well be "debug message".

Not all the messages are for debugging. Some are purely informational. From the dmesg manual page (emphasis added):

The default action is to display all messages from the kernel ring buffer.

Update: Alternatively, d is from "diagnostic". See: Why is dmesg called dmesg?.

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