They have a very practical purpose on the keyboard. These are tactile guides that help users to place fingers in the right position without looking down. These marks are part of the 'touch typing' ...

The little raised lines or bumps on the F and J keys are tactile markers. Basically, they are there to assist keyboard users in finger positioning without the need for looking down. The mentioned keys ...

Keyboards have small bumps on the F and J keys. These help people type without looking. The bumps guide fingers to the right spot. This makes typing faster and more accurate. June E. Botich patented ...