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Comment by rwmj | Hacker News Reader

Or "unit" in ML-derived languages and Haskell.

I always think of unit as one - it has exactly one possible value.

Void doesn’t exist in ML

log 1 = 0, so it has exactly zero bits of information.

Void definitely exists in ML.

  —- Haskell
  data Void

  (* Standard ML *)
  datatype void = Void of void