The semicolon is the standard SQL statement terminator in SQL*Plus. When you type a semicolon and press Enter, SQL*Plus recognizes the statement as complete and executes it. The forward slash (/) is used to execute the contents of the SQL buffer, not terminate a new statement. The colon (:) is used for bind variables in SQL*Plus. The period (.) is used in some SQL implementations but not in Oracle SQL*Plus for statement termination.