Orienteering Special Terms:
Control: This is the point, circled on the map, which you are looking for. The (usually) orange and white marker there is called a control marker.
Course: The orienteering course is the set of controls you are looking for.
Leg: A leg is the portion of a course between two consecutive controls.
Knoll: A small hill.
Contour: A brown line used to show topographic features. A contour is a line tracing land of a given elevation. Using contours, the shape of most landforms -- hills, valleys, slopes, knobs, even kettleholes and sand dunes -- can be shown.
Linear feature: A trail, stream, fence, stone wall, or other feaure that is basically linear. Contrast this with point features, like boulders, wells and springs, and area features, like fields and lakes.
Catching features: A large feature which is not easy to miss in the direction you are going. You might use a catching feature, such as a lake beyond a control, to "catch" you if you miss the control.