A coude telescope, also known as the bent or angled telescope, is a type of telescope that uses a system of mirrors and lenses to redirect light and produce high-quality images at a stationary eyepiece. There are several synonyms for the word "coude telescope," one of which is "diagonal telescope." The term "diagonal" refers to the mirror or prism that redirects the light path from the main mirror or lens of the telescope. Other synonyms for the coude telescope include the "angled telescope," the "bent telescope," and the "mirror telescope." These terms all refer to the same type of instrument, which provides a clear and stable view of the stars and planets.