When on a screen with your weapon drawn, holding the A and L buttons, and while doing this pressing the R button 39 times, releasing the A and L buttons and pressing R once more will cause the letters "NAS" to appear where the recharge percentage is normally displayed. This is most likely an Easter egg hidden by the Iranian-American programmer, Nasir Gebelli, who worked for Square on the first 3 Final Fantasy titles and Secret of Mana.