Synonyms for the term "power reflection coefficient" can include reflection coefficient, return loss, standing wave ratio (SWR), and voltage standing wave ratio (VSWR). All of these terms are typically used in the context of transmission line theory and refer to the ratio of reflected power to incident power in a given transmission line. The reflection coefficient is an important parameter for determining the efficiency of energy transfer within a transmission system and can be used to calculate various other important properties such as impedance and admittance. Different industries and fields may use different synonyms for this term, but their meaning generally remains the same.