Speed square - Wikipedia

Mr. Pen- Rafter Square and Combination Square Tool Set, Black, 7 Speed Square, 12 Aluminum Carpenter Square

Carpenter Square Rafter Square Triangle Ruler Speed Square - Temu

SHALL Rafter Square & Combination Square Tool Set, 7 Inch Aluminium-Alloy Carpenter Square & 16 Inch Zinc-Alloy Woodworking Framing Square Combo w/Stainless Steel Ruler, 2 Carpentry Pencils, Scriber

Rafter Square and Combination Square Tool Set, 7 Inch Triangle Carpenter Square

Woodworking Square Tool Carpenter Layout Aluminium Adjustable Combination Square Set Metal Carpentry Triangle Ruler - AliExpress

Top 10 Uses of a Rafter square, aka speed square

Choosing and Using Squares - This Old House

RONGPRO Multifunctional Rafter Square, 7 Inch Triangle Carpenter Square Metal Alloy, Rafter Square Layout Tool

Rafter Squares – TrigJig

WORKPRO Rafter Square and Combination Square Tool Set, 6-Pack One-Handed Clamp/Spreader, Bar Clamps for Woodworking