Squares

Squares of various types are used mainly to test the Squareness of a piece of material or a construction and also to mark lines, usually at right-angles, from an edge or surface

Carpenter's Try Square	Used for general woodworking when needing to test for Squareness or to mark lines at rigt-angles to a surface or edge - usually with a Marking Knife or Pencil.
Engineer's Try Square	For general metalworking, an all steel version is used. They resist wear well and are precision made to ensure accuracy. The notch on the inside of the stock is there to ensure the stock butts right up to the edge of the material without interference by small particles or burrs .
Double Square	This adjustable square can
Combination Square	###
Centre Square (or Centre Finder)	###
Mitre Square	###
Bevel Square (aka Bevel Gauge or Sliding Bevel)	###
Framing Square	###
Builder's Square	###
Set Squares	###
T-square	###