GG, mind if I explain??
All that I have gathered till now is:
7= The deep, glottal HHHH' sound
5= "KH" (or what GG said)
3= "aieen", if your familiar with arabic script... if not, its a glottal "aa"
2= It acts as an apostrophe in romanized Arabic
Though I think an Arab or an Arabic-speaking person could describe it better... I don't even know Arabic....