What is the reason for the bump on the metal keypad key "5"

author: Echo

The number "5" of the metal keypad with Braille has a raised point, according to "Blair's Braille Principle".

Interpretation: Braille, or Braille or embossed characters, is a text specially designed for the blind and perceived by touch. It is formed by making different combinations of bumps on the paper through a braille board, a braille machine, a braille printer, etc. Generally, the braille of each square is composed of six points. It was created by the blind French Louise Braille in 1824, so it is commonly referred to as "Braille". This is the reason for the bumps on the keys of the metal keypad.

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