ATM was invented by a wellknown Scottish inventor John Adrian Shepherd-Barron, the man who pioneered the development of the ATM machine. Barron was born in Shillong and was son to a Wimbledon ladies doubles champion, Dorothy Barron. When testing out his invention, Barron had also proposed a 6-digit PIN.
However, the first person to use his invention was his wife, Caroline. We all know that behind every successful man is a woman, and Caroline apparently rejected the idea of using a six code PIN for her husband’s invention because she could only remember the numbers up to four.
When Barron came up with the idea when he realized that he could remember his six-figure army number. But he decided to check that with his wife, Caroline.
“Over the kitchen table, she said she could only remember four figures, so because of her, four figures became the world standard,” he laughs.
Reportedly, 6 numbers stringed together were too much information for her to recall.
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