Offset

Offset[dx, dy, position] gives the position of a graphical object obtained by starting at the specified position and then moving by absolute offset dx, dy.

Offset can be used to specify offsets in any two-dimensional graphics primitive.

position can be either x, y or Scaled[x, y, ... ].

The offset is measured in units of printer's points, approximately equal to of an inch.

Offset[dx, dy] can be used to specify an absolute radius in a Circle or Disk object.

See The Mathematica Book: Section 2.9.4.

See also: Scaled, AbsolutePointSize, AbsoluteThickness.