Analog Devices VisualDSP++ 3.5 Manual page 26

Notation Conventions
Example Description
A note, providing information of special interest or identifying a
related topic. In the online version of this book, the word Note appears
instead of this symbol.
A caution, providing information about critical design or program-
ming issues that influence operation of a product. In the online version
of this book, the word Caution appears instead of this symbol.
xxvi VisualDSP++ 3.5 Linker and Utilities Manual
for 16-Bit Processors