Upper & Lower Circuit Price in PI

What does the Column "Upper ckt price" and "Lower ckt price" in Zerodha PI represent.  Is it the circuit price for the  current day (today),   or is it weekly / monthly ?

Since FnO stocks don't have upper / lower circuits, why do we have a value against "Upper ckt price" and "Lower ckt price" for ICICIBANK ?

Thank You.

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