IBM TS4300 User Manual page 290

IBM Confidential
A caution notice can be accompanied by one of several symbols:
If the symbol is... It means...
A generally hazardous condition not represented by other safety symbols.
A hazardous condition due to the use of a laser in the product. Laser
symbols are always accompanied by the classification of the laser as
defined by the U. S. Department of Health and Human Services (for
example, Class I, Class II, and so forth).
Risk of hand pinching, can trap hands, fingers and cause serious injury.
Keep hands clear during operation (L012).
Caution: moving parts. (L037)
The weight of this part or unit is between 18 and 32 kg (39.7 and 70.5 lb).
It takes two persons to safely lift this part or unit. (C009)
258 IBM TS4300 Tape Library Machine Type 3555: User's Guide