A small, often overlooked feature on computer keyboards – the raised notch beneath the 'F' and 'J' keys, and sometimes the number '5' – serves a crucial purpose for touch typing. This tactile marker allows typists to locate the home row without looking, significantly improving speed and accuracy. The feature originated with typewriters and was carried over to computer keyboards to facilitate efficient typing. It enables users to maintain correct hand positioning, reducing strain and increasing productivity. Most users learn to identify these notches during typing tutorials, becoming a fundamental element of touch typing proficiency. Despite its simplicity, the notch remains a vital tool for modern writing and data entry.