What should I do if the <π> icon blinks on the LCD panel?
A blinking <π> icon indicates the battery level is very low and the batteries should be replaced with new ones. If a misoperation has occurred, press the shutter button halfway or remove and reload the batteries. If the icon does not stop blinking after these steps, consult your nearest service center. (Page 49)
From the official Canon Eos Rebel T2 Camera manual, page 49
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