Charles Craft wrote:

> I learned that EPROM = erasable programmable read-only memory.
>
> What does the "E" stand for in a one-time programmable device?

  Erasable.  Just like in EPROM.  They actually contain EPROM guts, but in a
plastic case, so you can't erase it.  (cheaper too, ceramic and quartz is
expensive).
  And before you ask, yes, it's been tried to erase these, though not
successfully.  The EEPROM cells are only sensitive to UV, and that won't get
through the plastic.

> Shouldn't these devices be listed as PROMs?

  They are usually listed as One Time Programables (OTP).

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