Gerber OMEGA CP, Reference Manual

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Dimensioning Terminology
Annotation – A job or drawing related note created with the annotation dimension tool.
Arrowheads – Termination symbols, arrowheads mark the intersection of the dimension line
with the extension lines. The arrowheads indicate the end points of the measurements.
Constraints – Constraints cause the cursor to be attracted or snap to construction. Dimension
objects can be made to snap to shapes during dimension creation.
Dimension Line – A line or arc that represents the distance or angle sweep being measured.
The dimension line usually ends with an arrowhead at the extension lines. Depending on the
style, the dimension line may be broken into two parts: the first dimension line intersecting with
the first extension line, and the second dimension line intersecting with the second extension
line.
Dimension Text – Text describing the distance or angle measured.
Extension Line – Sometimes known as projection lines or witness lines. Two extension lines
form a gap or angle representing the distance or angle being measured.