From CoMakingSpace Wiki

Backsaws (Rückensägen) are woodworking hand saws with a stiff "back" strengthening the blade while limiting the achievable cutting depth.

They are commonly used in joinery.

Tenon Saws


Tenon Saws

Tenon saw.jpg
Synonyms: sash saws; DE: Zapfensägen
Type: hand saws
Material: wood
Used with: miter box, bench hook
Location: Handheld Wood Tool Area

Tenon saws are relatively large backsaws. As you may have guessed, they're good for cutting tenons!