On the Debian website, I found a list of the releases of Debian associate with alphanumerical architectures. Do you know to what those architectures numbers and letters stand for?
I asked on #debian-mentors, and Paul Wise pointed me to a bug report. The entries you see are caused by a bug. See the Debian bug report http://security-tracker.debian.org/tracker/data/releases broken.
07:05 < pabs> faheem: https://bugs.debian.org/610222 07:06 < pabs> faheem: I guess patches would be welcome 07:15 < ats> faheem: so my first guess was that it was a Plan 9-style code, but no, it's just a bug 07:16 < ats> I think what's happening is that it's taking a list of architectures along the lines of "i386,armhf,kfreebsd-i386" and splitting it by characters rather than on , 07:16 < ats> so that's actually a list of all the characters that are used in Debian architecture names ;-) 07:17 < ats> line 407-ish in http://anonscm.debian.org/viewvc/secure- testing/lib/python/security_db.py?view=markup suggests that it does split on , first, though, so presumably that's not getting used properly when fetching the arch field from the database...
Note. Patches welcome. :-)