A diagonal scale is a useful tool for architects, engineers and designers. However, there are numerous synonyms for this term which can be used interchangeably. One such synonym is the engineer's scale which is a special ruler used to measure dimensions in engineering and architectural drawings. Another popular synonym for the diagonal scale is the triangular scale, which is a three-sided ruler with calibrated gradations. Other synonyms for the term include grading scales, rulers, proportional scales, and linear scales. The use of the diagonal scale is essential in the field of engineering and architecture, and the synonyms for the term make it easy for professionals to find the tool they need to get the job done.