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What does “:pts/1:S.0” mean?

From the output of last on RHEL5 user3 pts/6 :pts/1:S.0 Sat Feb 26 04:04 - 05:40 (01:35) user2 pts/7 :0.0 Fri Feb 25 21:32 - 04:53 (07:21) user1 pts/6 ...