Allah is the Arabic word for God. It is compounded of "Al", the definite article 'the', and "illah", meaning "god". Therefore, Allah literally means "The God" -- somewhat parallel to the capitalized "God" in English. The name Allah is used by Muslims world-wide, as well as Arabic-speaking Christians, Jews, and others. It is written in Arabic as Ηααε
From an Islamic point of view, Allah is the special name of God and is the most precious name because it is not a descriptive name like the other 99 Names of Allah, but the name of God's own presence. It is impossible to alter the word in Arabic; such as create a plural form (gods) or change the gender. The Islamic concept of mankind's place in the universe hinges on the notion that God is the only true [reality]. There is nothing permanent other than God. God is considered eternal and "uncreated", whereas everything else in the universe is "created."
Allah is considered by Muslims to be omnipotent, omnipresent, and omniscent. Islam teaches that other religions have, in one way or another, distorted and nullified a pure and proper belief in Almighty God by neglecting His true teachings and mixing them with man-made ideas.
Muslims do not try to draw or depict God in any way, according to Islamic belief it could lead to idol worship. Instead, we focus on His 99 Names and attributes that are stated in the Quran. Nearly one third of the book is used describing God's attributes and actions. Also, "hadith qudsi" are special recorded sayings of Muhammad to Muslims where he quotes what God says to him. The 99 "Attributes" are frequently written in calligraphic Arabic as a permissible decoration, which adorns mosques and homes of Muslims.
Here is an example of the name "Allah" written in simple Calligraphic Arabic:
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