PX is a common abbreviation for several different words, but in most contexts, it refers to "pixels," which are the small points of light that make up digital images. However, there are several other synonyms for PX that can be used depending on the specific context. For example, in military terminology, PX refers to a post exchange, which is a store on a military base that sells goods to service members. In chemistry, PX can stand for a particular type of ion exchange resin used in water treatment. Additionally, PX can also refer to a private equity firm or an aircraft model produced by Peugeot.