Trammel wheel, also referred to as ellipsograph or trammel, is a mechanical device commonly used in geometry, engineering, and drafting. It is employed to draw precise ellipses or oval shapes by fixing one point and adjusting the position of another along rotating arms or bars. Synonymous terms for a trammel wheel include an ellipse trammel, eccentric trammel, or elliptical compass. These alternative names are used to describe the same tool that aids in accurately constructing symmetrical ellipses or ovals with ease. Whether one calls it a trammel wheel, ellipsograph, or elliptical compass, this versatile instrument is essential for many creatives, designers, and engineers.