The term "double-blind" is typically used in scientific research to describe a study in which neither the researchers nor the participants know which treatment is being administered. There are several synonyms for this term, including "masked," "blinded," "placebo-controlled," and "randomized controlled." These terms describe the same type of research design, in which both the researcher and the participant are blinded to the treatment being administered. This is an important technique for reducing bias and ensuring the results of the study are valid and reliable. Additionally, double-blind studies are considered the gold standard for clinical trials in medicine and other fields.