# Definition:Bourbaki Dangerous Bend Symbol

## Definition

The Bourbaki dangerous bend symbol is a symbol invented by the Bourbaki group to warn the reader that there exists the serious possibility of making a common mistake while interpreting or utilising the material presented.

It was originally presented by Bourbaki, as the pre-$1949$ French traffic road sign:

Variants exist, notably Donald Ervin Knuth's version:

## Source of Name

This entry was named for Nicolas Bourbaki.