GMC Defense 2006 Owner's Manual Supplement page 4

Safety Warnings and Symbols
You will find a number of safety cautions in this book. We
use a box and the word CAUTION to tell you about things
that could cause personal injury if you were to ignore the
warning.
CAUTION:
These mean there is something that could hurt you
or other people.
In the caution area, we tell you what the hazard is. Then
we tell you what to do to help avoid or reduce the hazard.
Please read these cautions. If you don't, you or others
could be hurt.
You will also find a circle
with a slash through it in
this book. This safety
symbol means "Do not,"
"Do Not do this" or
"Do Not let this happen."
Vehicle Damage Warnings
Also, in this supplement manual you will find notices.
Notice: These mean there is something that
could damage the vehicle.
In the notice area, we tell you about something that can
damage the vehicle. Many times, this damage would not
be covered by the warranty, and it could be costly. But the
notice will tell you what to do to help avoid the damage.
When you read other manuals, you might see CAUTION
and NOTICE warnings in different colors or in different
words.
You'll also see warning labels on the vehicle.
They use the same words, CAUTION or NOTICE.
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