How is the term "square" used in carpentry?

The term "square" in carpentry primarily refers to an essential tool used to verify that angles are 90 degrees or to ensure that components are properly aligned. When constructing various projects, achieving perfect right angles is crucial for structural integrity and aesthetic appeal. Carpenters utilize a square, often a framing square or speed square, to check corners of frames, doors, and other elements of a build. This ensures that everything fits together correctly and operates as intended, preventing issues later on in the construction process.

The other options involve important aspects of carpentry but do not pertain specifically to the term "square." Measuring lengths accurately, calculating material costs, and determining load-bearing capacities are all vital skills in carpentry, but none relate directly to the specific meaning or application of "square" in the context of checking angles and alignment in construction.