Interoperable interactive geometry for Europe
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This symbol applies to points and elements that contain particular points, such as segments, polygons and rays, but not to circles or lines. Can have the following values:

  1. circle (default value)
  2. circumference (an empty, transparent circumference)
  3. cross (+)
  4. x-mark (x)
  5. square
  6. triangle (pointing upwards, as a delta)
  7. point (a single pixel).
  8. an image. It has not been discussed exactly how to indicate this; I imagine it will be something like filename in container or something similar.