Gas cylinder bank

ISO 10628-2 (C0002 gas cylinder)

Drawn as

A row of tall narrow cylinders with domed tops (gas bottles), each with a valve, joined to a common manifold.

Meaning

Bottle rack or quad of compressed gas: nitrogen backup, calibration gas. Becomes gas-cylinder-quad. CO2 or inert-gas fire-suppression banks are drawn the same but belong to fire & gas.

Variants

A single bottle is one cylinder symbol
Quads are often drawn as one box labelled "N2 QUAD"