Omron GQ-CRM21 Operation Manual page 10

Safety Precautions
Symbols
The circle and slash symbol indicates operations that you
must not do.
The specific operation is shown in the circle and explained
in text.
The symbol at the left means "do not disassemble."
The triangle symbol indicates precautions (including warn-
ings).
The specific operation is shown in the triangle and ex-
plained in text.
The symbol at the left is for a general precaution.
The filled circle symbol indicates operations that you must
do.
The specific operation is shown in the circle and explained
in text.
The symbol at the left shows a general precaution for
something that you must do.
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