Bourbaki... caveman(?) symbol

Question

I don't know if this is the best place to ask this question, but I'm sure many of you are familiar with the Bourbaki "dangerous bend" symbol: The idea behind the symbol is to indicate a particularly conceptually challenging part of the text, which could potentially be skipped when reading through for the first time.

Now, my question is: is there an equivalent "caveman" symbol?

I came across this in a set of notes on analysis:

The symbol appears next to all definitions, I suppose the idea is that when a concept is defined (especially in analysis) we are bound to discover something new (akin to a cave man).

What is this symbol called? Is it commonly used, similarly to Bourbaki? Is there a LaTeX package for it?

Answer 1

I have not seen the caveman symbol. Therefore, I conclude it is not commonly used. Any questions about it should be addressed to the author of those analysis notes.

Even for the Bounbaki "dangerous bend" symbol: if you use it, define it the first time.

Answer 2

This symbol can be found on page 151, Table 417 in Scott Pakin's Comprehensive $\LaTeX$ symbol list. It comes from the phaistos symbols and is obtained by the $\LaTeX$ command $\texttt{\\PHpedestrian}$.