Suse 9, [kacpid] and display of "ps"

WHAT DO THE BRACKETS mean? (down below)

Hello there:

I have a Suse 9 machine as:
------------------------------------------------------------------
# uname -r
2.6.5-7.97-smp
# cat /etc/issue

Welcome to SUSE LINUX Enterprise Server 9 (i586) - Kernel \r (\l).
------------------------------------------------------------------

I am trying to determine if the acpi daemon is running, but all I find is:

# ps aux|grep acp
root         5  0.0  0.0     0    0 ?        S<   Sep22   0:00 [kacpid] 

There is no reference whatsoever to "kacpid" in /etc/init.d

Also, WHAT DO THE BRACKETS in [kacpid] mean?
I have always wondered about those brackets and "man ps" doesn't really
help...

Appreciate any help.
Thanks
Enrique
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