i found this specific word used excessively in both the Alhambra's Engravings in the main hall and the emirate's coat of arms and flags as well, and it does not seem like a quote from the Koran or Islamic sources
i really hope someone answer me this time
It's simply the motto of the Nasrid dynasty - Wa-la Ghalib illa Allah in kufic script - "There is no victor but Allah".
There are a couple of myths on the origin which go back to Mohammed ibn Nasr. See pages 21 and 22 in Vibrant Andalusia: The Spice of Life in Southern Spain. Either an angel waving a flag with the slogan or his remarks to the crowd on being hailed as a conqueror of Seville. Either way they became the motto of the Nasrid dynasty and ended up carved pretty much everywhere in the Alhambra.