You may never have noticed it, but no matter what brand of computer you have, its keyboard always has a raised line or dot on the F and J keys.

Quite simply, it’s a marker that allows the user to position their fingers without having to look at the keyboard, and therefore type faster. For visually impaired people, these markers are even more important.

But why the F and J letters?

You may not know it, but the layout of letters on AZERTY keyboards is far from optimal. These layouts were not invented to help us type faster, but to solve a technical problem on old typewriters.

Indeed, on these machines, when two contiguous keys are pressed at the same time, or almost, their stems can collide. To avoid this, it was decided to move the letters that are most likely to follow each other in the words further apart.

Today, this problem no longer exists on computers. But as everyone has been used to the AZERTY keyboard, it is difficult to change this layout.

In any case, on AZERTY or QWERTY keyboards, the raised strokes on the letters F and J are very handy markers. As explained in a Business Insider post, these lines allow the user to find an area called the “home row.

On a QWERTY keyboard, when the user isn’t typing anything, their fingers are supposed to be positioned on the letters ASDF and JKL. On an AZERTY keyboard, this home row corresponds to other letters. But the index fingers must always be positioned on the letters F and J.

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It should be noted that today, there are other keyboard arrangements that might allow faster typing, such as bepo, which, according to its website, “is based on a statistical study of the French language”. But the AZERTY remains popular.