HP ProLiant DL20 Gen10 Plus Maintenance And Service Manual page 50

This symbol indicates the presence of a laser device in the product that may exceed Class 1 limits. Refer to the product
documentation for more information.
This symbol indicates the presence of moving parts inside the product that may present a pinch point if improperly contacted.
WARNING: WARNING:
Hazardous moving parts. Do not insert any tools or any part of your body into the product
while it is operating or in any openings.
Symbols on equipment 50