@ytsejam1138: That's a bit mystifying, 'cause KUAL doesn't support printing stuff in gray ^^.
In any case, it's probably black but with ghosting, so, on to the explanation: it force launches the OTA updater. (It used to be useful because the system doesn't always detect new packages, so this was needed when you pushed packages over SSH, for instance).
TL;DR: (Mostly) Perfectly useless now that we have MRPI

.