Huh, Never heard that term, and I'm old... On a lark I Googled this. The only thing I can find is that it's another name for the manual drill typically called a Brace, or when coupled with an Auger, a "Brace and Bit". Maybe it's an "English" term.
Then there is the French brace.... French Brace: Wooden Right-angle-trianglular brace which is hinged to the flat (using pin hinges for quick removal). Provides a more solid support than a stage brace, but takes up more space in storage.
Should be used for large flats as it provides support over the vertical run of the flat more effectively.
Huh, Never heard that term, and I'm old... On a lark I Googled this. The only thing I can find is that it's another name for the manual drill typically called a Brace, or when coupled with an Auger, a "Brace and Bit". Maybe it's an "English" term.
Thanks all for your replies. I thought I have missed some new or very old bracing system. Finally found the person and asked. What he called a German Brace is a Chevron Brace. I guess he has called it that for so long it became a thing to him.