• This card's Japanese name is "Death Calculator".
    • This card's English name is more or less the same, except with different words. An Abacus is an ancient calculator.
  • There are a total of 19 eyes being used as counters on the abacus.
  • In "Kozaky's" storyline, it is revealed that this device can perform all calculations, so long as you remember the equations.
  • "Coffin Seller" has an effect similar to this one, but only affects your opponent.
    • Both card's names and artworks are also macabre-themed.
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