I would guess it's a range

...which is also confirmed by this piece of code from mktables (which creates those tables):

sub Table::Write
{
    ...
    for my $set (@$Table)
    {
        my $start = $set->[RANGE_START];
        my $end   = $set->[RANGE_END];
        my $name  = $set->[RANGE_NAME];

        if ($start == $end) {
            push @OUT, sprintf "%04X\t\t%s\n", $start, $name;
        } else {
            push @OUT, sprintf "%04X\t%04X\t%s\n", $start, $end, $name
+;
        }
    }
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