Center of lift
From Kerbal Space Program Wiki
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The center of lift is one of three measurable forces used mainly in planes, showing axis and direction of lift, provided by wings, control surfaces and winglets. Inside the editor is showed as a cyan ball (axis) along with an arrow (direction of the lift).
Uses in plane bulding
The center of lift in a plane defines its behavior in flight. Depending on where is located, the shifting weight of fuel and location in relation to the center of mass can turn a plane very unstable. It's recommended to place the center of lift slightly behind the center of mass, to prevent it from being behind the center of lift, otherwise making it unstable and hard to maneuver.
