In chemistry, biology or biochemistry may refer to
In buisness may refer to (corporation, enterprise...etc)
In computing may refer to
In education may refer to:
In organizations may refer to
In Other Science May refer to
of the PDH/SONET frame, Byte D1-D3 (DCCR) in Regenerator Section or/and D4-D12 (DCCM) in Multiplex Section;