What does this kill command do?

I don't have access to a UNIX box right now. I checked the Internet, and I can't find what the "-3" in the command line mean.

-3 means SIGQUIT
 1) SIGHUP       2) SIGINT       3) SIGQUIT      4) SIGILL
 5) SIGTRAP      6) SIGABRT      7) SIGEMT       8) SIGFPE
 9) SIGKILL     10) SIGBUS      11) SIGSEGV     12) SIGSYS
13) SIGPIPE     14) SIGALRM     15) SIGTERM  

So what does the SIGQUIT signal do?

We have a script that do a thread dump of the processes. The kill command was taken from the script.

It depends what handler the process has set for that signal.
If the process has not set a handler, the default action is to dump core and quit the program.

Apart from SIGKILL, how the process handles all the other signals is entirely up to the process itself.

Some common behaviours are:

SIGHUP - used to restart a process, eg: a configuration file has changed and needs to be reread.
SIGQUIT - Dump core or debug file.

Thanks guys!