imul assembly instruction - one operand?

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I am using a run-time debugger.

EAX: 0000 0023 EDX: 5555 5556

imul edx

EAX: aaaa aac2 EDX: 0000 000b

I am utterly confused, and can't figure out how this multiply is working. What's happening here? I notice in a similar question here that imul ebx ; result in EDX:EAX I don't understand the EDX:EAX notation though :/

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