How many spellings do exist for Quran's text? How many rasm-al-mushaf do we have?

Consider these two lines: > الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِینَ and > ٱلْحَمْدُ لِلَّهِ رَبِّ ٱلْعَٰلَمِینَ As you can see, ٱلْعَٰلَمِینَ is spelled in two different forms. I took them from two different sites. One from Quran's Database , and the other from Recite Quran . As I'm watching their texts, they have many different spellings in different parts. I wonder, how many spellings and system of writings do we have for Quran? And I'm only interested in Arabic language. **Update**: Thank you for pointing me to the right direction. Now my question becomes as simple as: **how many rasm-al-mushaf do we have?**