Pseudopupil refers to the illusion of a pupil in the compound eye of insects and arthropods that occurs as a result of reflection or refraction of light. Some possible synonyms for pseudopupil include false pupil, apparent pupil, simulated pupil, and virtual pupil. Another synonym that can be used in certain contexts is ommatidial reflection, which describes the light reflecting off individual sections of the compound eye. Although the term pseudopupil is specific to insects and arthropods, the concept of an illusory or simulated pupil can be extended to other animals and even synthetic objects that mimic the appearance of eyes.