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Operational technology (OT) is the umbrella: all the technology that supports an organization's operations.
An industrial control system (ICS) is the hardware, software and networking used to control, monitor and automate industrial processes. An organization may run one ICS for its HVAC, one for a factory line, one for access control, and others besides. Together, they make up its OT. SCADA, distributed control systems (DCS) and PLC-based systems are kinds of ICS.
One ICS can be large. NIST SP 800-82 describes a single SCADA system supervising a whole pipeline or water network, and a single DCS running a whole refinery. Size does not make it OT; it is still one system.
To sort a card, count the separate systems it describes. One system, however much it runs, is an ICS. Two or more separate systems are part of the organization's OT.
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