Rolodex is a popular brand name for a rotating file card holder, but there are other synonyms that can be used to describe a similar product. One synonym is a rotary card file, which is a similar product but without the brand name. Another option is a business card organizer, which can be used to store and organize important business contacts. A third synonym is a contact management system, which can be digital or physical and can be used to manage customer and client information. Other synonyms include a card index, a card case, and a card holder. No matter what synonym is used, the purpose is the same-keeping important information organized and easily accessible.