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Accuracy
How close a measurement conforms with a standard or accepted value

Apparent Dip (α)
The inclination of a place measured in a direction not perpendicular to strike

Dip (δ)
The inclination of the line of greatest slope of an inclined plane, measured perpendicular to strike

Fold line
A hinge line along which a vertical cross section may be constructed and then flattened out to a horizontal or map view

Pole
A line perpendicular to a plane, an represented as a opoint on a stereographic projection

Plunge
The vertical angle between a line and horizontal

Precision
The degree of agreement or consistency of repeated measurements

Rake (Pitch)
The angle measured in a specified plane, between a line and the horizontal

Slope Angle (σ)
The angle from the horizontal down to the slope

Steronet
A representation of angular relationships between planes and lines

Strike
The bearing of a horizontal line in an inclined plane

Thrickness
The perpendicular distance between the top and bottom of a geologic unit

Trend
The bearing of the vertical plane containing a line

β
The angle between strike and the apparent dip direction