The Advent wreath is a circular garland of evergreen branches representing eternity. On that wreath, five candles are typically arranged. During the season of Advent, one candle on the wreath is lit each Sunday as a part of the Advent services.
Combined DNA Index System. The Combined DNA Index System (CODIS) is the United States national DNA database created and maintained by the Federal Bureau of Investigation.
A relational database is a digital database based on the relational model of data, as proposed by E. F. Codd in 1970. A software system used to maintain relational databases is a relational database management system (RDBMS). Virtually all relational database systems use SQL (Structured Query Language) for querying and maintaining the database.