[RndTbl] PTS?

When I run "last" on Solaris 11, I get (e.g.): # last -n 300 -a | grep oracle | head root sshd Mon Aug 20 03:48 - 03:48 (00:00) oracle-oem-oc-mgmt-cowsvpsys07 root sshd Sun Aug 19 16:56 - 16:56 (00:00) oracle-oem-oc-mgmt-cowsvpsys07 root sshd Sun Aug 19 07:32 - 07:32 (00:00) oracle-oem-oc-mgmt-cowsvpsys07 root sshd Sat Aug 18 21:18 - 21:18 (00:00) oracle-oem-oc-mgmt-cowsvpsys07 root pts/3 Sat Aug 18 13:17 - 12:55 (1+23:37) oracle-oem-oc-mgmt-cowsvpsys07 root sshd Sat Aug 18 13:17 - 12:55 (1+23:37) oracle-oem-oc-mgmt-cowsvpsys07

My question is why is there sometimes a pts AND sshd, and other times just the sshd? What does that mean?