FILENAME EXTENSION is a suffix to the name of a computer file applied to indicate the encoding convention (file format) of its contents, e.g. example.xls, to where the .xls indicates a Microsoft Excel file.
NBB see NON-BULLETIN BOARD.
COVENANT is a clause in a contract that requires one party to do, or refrain from doing, certain things. It is usually a restriction on a borrower imposed by a lender.
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