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sometimes "caution" is used as an attention-getter to indicate a risk of
physical injury, sometimes "warning".
The Microsoft Style Guide says this:
A *caution *is a type of note that advises users that failure to take or
avoid a specified action could result in loss of data.
Caution* To avoid damaging files, always shut down your computer before you
turn it off.
A *warning *is a type of note that advises users that failure to take or
avoid a specific action could result in physical harm to the user or the
hardware. Use a warning, not a caution, when physical damage is possible.
Are there any other references that clearly describe the use of "caution",
"warning" and other attention-getters?