What signal 0 does in kill command?

Issue

• What signal 0 does in kill command?
• when I execute "kill -0 PID" and PID is the id of a thread, the command exit without errors.

[root@host ~]# ps -eo pid,comm|grep -c 10252
0

[root@host ~]# kill -0 10252;echo $?
0

[root@host ~]# cat /proc/18020/task/10252/stat
10252 (imsd) S 1 18020 18020 0 -1 4202560 4 0 0 0 2 1 0 0 19 -1 1351 0 987845280 615174144 118443 18446744073709551615 134512640 139793320 4286914320 3934351508 4151395376 0 16391 4096 16391 18446744071580550505 0 0 -1 8 0 0 3 0 0

• Is that the correct behavior of kill -0 command ?