Tough Rubber Sheath

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A typical TRS cable. The conductors are actually copper but are coated and look silver.
A typical TRS cable. The conductors are actually copper but are coated and look silver.
Cross section. Note the solid core center earth wire and multi strand power wires.
Cross section. Note the solid core center earth wire and multi strand power wires.

Tough Rubber Sheath (TRS) cable normally consists of a black outer sheath of rubber with several conductors.

In the US this is obsolete wiring, circa 1949-1969. TRS is in current use in the UK where greater mechanical toughness is required than PVC provides.