Autocollimation is a term that refers to the technique of using a single optical component to both produce a light beam and receive its reflection. This technique is commonly used in optical instruments and devices to align and calibrate optical systems. Some synonyms for autocollimation include self-collimation, self-alignment, and self-focusing. The concept can also be expressed using terms like mirror alignment, retroreflective alignment, or mirror auto-correction. Regardless of the term used, autocollimation is an essential process in various fields ranging from astronomy to biomedical imaging, and it remains a crucial technique in precision optics manufacturing.