Straight arch, also known as a flat arch, is a type of architectural feature found in buildings and structures. It is characterized by its lack of curvature, and instead is a straight line that spans over an opening. There are various synonyms for the term straight arch, such as square arch, plain arch, and lintel. Each term emphasizes the basic and simple design of the arch, as well as its functional purpose of supporting weight and distributing it evenly. While straight arches may not be as visually stunning as other types of arches, they are a reliable and practical solution for many architectural needs.