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It will sometimes appear in a reading to reveal a period where you concentrate all your thoughts and aspirations on one target, and then channel all your energies into that project, to the exclusion of all else.
Sometimes people do this in order to avoid facing emotional pain and distress. It's worth looking for evidence of this when the 3 of Disks comes up. Whilst it can be useful in the short-term to achieve something when you feel hurt, it can often be very damaging if you continue to hide from your own feelings. (Source: Angelpaths)