Dimensions
The dimensions define some overall lengths and angles of the bow, including an optional stiff middle section.

Draw
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Brace height: Distance between the deepest point of the handle and the string at rest
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Draw length: Distance between the deepest point of the handle and the string at full draw
Handle
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Length: Optional length of a stiff middle section (grip/riser) between the limbs
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Setback: Distance between the deepest point of the grip and the attachment point of the limbs to the middle section
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Angle: Angle at which the limbs are attached to the middle section
See the image below for a visual definition of the dimensions.