Random FactsCuriousOneatm, four, Inventor, length, pin, remember, six, twelve, WifeComment

The inventor of the ATM John Shepherd-Baron, originally made 6 digit pin codes, but his wife could only remember four. So that's what stuck

Random FactsCuriousOneatm, four, Inventor, length, pin, remember, six, twelve, WifeComment
The inventor of the ATM John Shepherd-Baron, originally made 6 digit pin codes, but his wife could only remember four. So that's what stuck
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The inventor of the ATM, John Shepherd-Barron, at first envisioned a six-digit numeric code for customer authentication. His wife however could only remember four digits, which became the most commonly used length.[3] @Curionic

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