Brassinosteroids are plant steroidal hormones that are important for growth and development. These hormones are synthesized naturally in plants and play a fundamental role in various physiological processes, including plant growth, stress responses and seed germination. Brassinosteroids are also known as BRs, a common abbreviation used by researchers to designate these important plant hormones. Other synonyms used for brassinosteroids include: brassins, brassinolides, and castasterone. Additionally, some researchers refer to the plant hormones as BR-like substances or brassinosteroid-like compounds. These different synonyms all refer to the same group of plant hormones that play an important role in plant growth and development.