You can look through to find something very specific for your purposes--which would be a damn sight easier if they would put them all on one searchable page.
A couple that might be suitable that I already encountered before are:
ERROR_CONTROL_C_EXIT 572 (0x23C) ERROR_FATAL_APP_EXIT 713 (0x2C9)
Generic enough that they aren't likely to be confused with any "expected values"--specific enough to suggest something abnormal happened.
In reply to Re^3: Killing a process on Windows (Win32::Process question)
by BrowserUk
in thread Killing a process on Windows (Win32::Process question)
by rovf
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