System: RedHat Linux 6.1, upgraded from RedHat Linux 6.0.
The upgrade wasn't smooth at all (had to do it twice because
the installer crashed), so it may be a "leftover".

[root@nosfer /dev]# ls -l /dev/ttyp[0-9]
crw-r--rw-   1 root     tty        3,   0 Nov  1 12:17
/dev/ttyp0
crw-r--rw-   1 root     tty        3,   1 Nov  1 12:17
/dev/ttyp1
crw-r--rw-   1 root     tty        3,   2 Oct 29 15:29
/dev/ttyp2
crw-r--rw-   1 root     tty        3,   3 Oct 19 14:37
/dev/ttyp3
crw-rw-rw-   1 root     tty        3,   4 May  5  1998
/dev/ttyp4
crw-rw-rw-   1 root     tty        3,   5 May  5  1998
/dev/ttyp5
crw-rw-rw-   1 root     tty        3,   6 May  5  1998
/dev/ttyp6
crw-rw-rw-   1 root     tty        3,   7 May  5  1998
/dev/ttyp7
crw-rw-rw-   1 root     tty        3,   8 May  5  1998
/dev/ttyp8
crw-rw-rw-   1 root     tty        3,   9 May  5  1998
/dev/ttyp9