BVVB: copper core PVC insulated flat (B) wires.
AVR: copper core PVC insulated installation (A) with a soft (R) wire
RV: soft copper conductor cable without sheath.
AVRB: copper core PVC insulated flat flexible cable for installation
RVB: soft copper conductor flat cable without sheath.
RVS: copper core PVC insulated twisted (S) flexible cord for connection.
RVV: Copper core PVC insulated flexible wire (before a V represents PVC insulated, PVC sheathed after showing a V).
AVVR: copper core PVC insulated flexible cable installation.

As for specifications, and other core 3, 4, etc. core and 3 + 1 3 Common specifications and other core is the same cross-section, 3 + 1 is a cross-sectional ground is half of the phase line. Currently 50 square etc. The following are the core. Wire and Cable 3.6 / 6kv refers to the rated voltage (use the occasion / voltage) wire models: the letter B represents the wire cloth, the letter V represents PVC plastic, the letter R represents the cord. There are copper core symbols, hard-line (common single conductor) symbol omitted no representation.

BVV represents PVC insulated, PVC sheathed, copper core (hard) wire cloth. Often referred to as the sheathed cable, single core is round, the dual-core is flat. Often used for surface mounted wiring. BVR represents PVC insulated, copper core (soft) wire cloth. Often referred to as the cord. Since the wire is relatively soft, and are often used in electric drive motor and wire connections often slight movement of the occasion.