画地为牢指天为枷
[huà dì wéi láo zhĭ tiān wéi jiā]
This nickname means 'Drawing a circle on the ground and using the sky as shackles,' symbolizing voluntarily restricting oneself with intangible yet self-imposed boundaries, often referring to limiting oneself psychologically or in terms of actions. It reflects a state of self-restraint, as if the person willingly lives within invisible restrictions.