wing slats and slots
wing - How do slats actually work?
Let’s begin at the leading edge of the wing, where slots and slats are located.
A New Flow Control Method of Slat-Grid Channel-Coupled Configuration ...
Slats are rarely used on light aircraft, except for some STOL models that are built with fixed leading-edge slats to improve take-off and landing performance.
Lot vs Slot - What's the difference?
Exploring the Differences Between Slots and Slats.