Toshiba Satellite Pro R50-B series User Manual page 23

Indicates a potentially hazardous situation, which could result in death or
serious injury, if you do not follow instructions.
A caution informs you that improper use of equipment or failure to follow
instructions might cause data loss, equipment damage, or might result in
minor or moderate injury.
Please read. A note is a hint or advice that helps you make best use of
your equipment.
User's Manual 1-19