What is a t-square used to do in technical drawing?

A t-square is a drafting tool used in technical drawing to create straight lines and ensure accurate measurements. It consists of a long horizontal bar (the blade) attached to a perpendicular short bar (the head), which is aligned with the edge of a drawing board. The t-square helps in drawing horizontal lines and assists in setting up other geometric shapes and angles with precision. It's an essential tool for architects and engineers in producing clear and accurate technical drawings.