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Unique data used by block cipher modes of operation to randomize the output in order to achieve semantic security. Also for other similar constructs in other iterative algorithms.

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IV vector is not random. Is it critical?

Reading the spec of one of the IoT protocols, I found that IV for it one isn't actually random, it consist of $n$ bytes that represents manufacter-specific string; the same for all devices plus 6 byte …
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