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What could it refer to but the flash storage of the phone? Hence the NetBoot: the phone has no working non-volatile storage.

The logic gate was my only familiarity with the term.

Flash memory comes in multiple flavor, named after the logic gates that the organization of their transistors resemble. So there is NAND Flash, NOR Flash, and Vertical NAND Flash memory.

I agree that referring to "NAND Flash Memory" as "NAND" is rather confusing. Similar to referring to "crypto-currency" as "crypto".

And similar to referring to a "CMOS image sensor" as "CMOS" or referring to a "battery-backed CMOS SRAM" (for BIOS configuration) as "CMOS"... But due to historical reasons (e.g. CMOS made battery-backed SRAM possible, NMOS or PMOS drains the battery in no time), these terms are stuck forever.

From the end of the post:

> This iPhone would never be able to boot iOS again, as its nvme nand is completely dead.

That just raises further questions.

NAND flash memory, like those used in SSDs, has limited lifetime, after too many writes they will just be dead (although in practice it means several terabytes of writes). Manufacturing defect is also possible.

My first thought would be flash storage. So I would read that as no or failing local storage on the phone.