The acronym RAFP stands for "retained austenite and ferrite percentage" and is commonly used in metallurgy to describe the amount of these microstructures in a material. Synonyms for RAFP include retained austenite content, austenite retention, and ferrite-austenite ratio. These terms are all related to RAFP in that they describe the amount of retained austenite and ferrite present in a material. Other related terms include retained austenite volume fraction, austenite volume fraction, and ferrite volume fraction, which are all proportions used to describe the amount of these microstructures in a material. Understanding the RAFP of a material is important for predicting its mechanical properties and performance under certain conditions.