Source.tmbundle "Continue line comment" snippet

Sorry for being stupid, but could someone please tell me what the -^-
character that's the default keyboard shortcut for the Continue line
comment snippet in the Source bundle actually corresponds to on the
keyboard?  It's #^C (as in the actual single character '^C', not '^'
followed by 'C') as rendered by less on the ascii plist.  I've made a
number of educated guesses, but all to no avail.  This is just making
me feel stupid.  I could rebind it, but my experience has generally
been that the defaults for things like this are actually quite clever,
and I like to know what they are before choosing something else.

Thanks.
-jrk