RSL is an abbreviation for the term "Retirement Sloping Land". It refers to a type of land that is sloping, and is commonly found in areas where retirees prefer to settle. There are a variety of synonyms for the term RSL, including retirement community, senior living, retiree village, active adult community, and 55+ community. These terms all refer to the same type of community, which is designed specifically for retirees and seniors. RSL communities are popular among retirees due to their relaxed lifestyle, social atmosphere, and access to amenities and healthcare.