What type of engraving is this called?

[Trapper1993]

I would like to make little fur trade trinkets but I'm having trouble trying to figure out what method of engraving they used on trinkets like this

 

[64Springer]

Ziggurat. A style of ancient temple. Where the term Zig-Zag comes from.

It's a little known fact that Donald Trump patterned his signature after that style of incising.

 

[martin9]

Wriggle engraving....Jack Brooks put out a dvd you can still get that shows how to do it.

 

[Trapper1993]

Thank you!

 

[SDSmlf]

Schippers’ book also explains the ‘wiggle-line’ technique.