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With this option you can select one entity (a point, line, surface or volume), and a pair of crossed red lines will signal the center of the entity in the graphical window.
They must be existing entities, except the special case of points or nodes, where they can be existing or defined with any of the usual methods.
The Superpose Lines option (in the Contextual menu) is useful when in render mode. Depending whether it is set or not, the crossed red lines will either be in front of the object or partially hidden by the model.