The SIGTERM signal is sent to a process to request its termination

$ps aux | grep nautilus
jeffrin   3412  0.4  2.4 839692 96464 ?        Sl   18:45   0:12 /usr/bin/nautilus --gapplication-service
jeffrin   4714  0.0  0.0  12904  1064 pts/1    S+   19:35   0:00 grep nautilus
$kill -TERM 3412
$ps aux | grep nautilus
jeffrin   4722  0.0  0.0  12904  1012 pts/1    S+   19:36   0:00 grep nautilus
$