The term "string line" is commonly used in construction and refers to a length of string that is used to create a straight line. However, there are several synonyms for this phrase, including "chalk line," which is a type of string line that is coated in chalk and used to mark a straight line on a surface; "mason's line," which refers to a high-tensile strength string line that is used in bricklaying; and "builder's line," which is a term that is often used interchangeably with "string line" and refers to any type of line used in the process of building or construction. Regardless of the specific term used, a straight line is essential in many construction and building projects.