The Tanween is a term for a letter having a short vowel with a hidden Nun saakin. Instead of writing any short vowels َ- ِ- ُ- plus letter Nun saakin نْ - respective vowel sign is doubled as a shortcut. TheTanween signs are generally indicated at the end of a noun, which make a noun indefinite. example بَنْ will written as ﺑً will sound as "ban".
Fathatain  (Dou Zabar) ﹰ
Fathatain ﹰ vowel sign consists two components (1)  Fat’hah َ- "ā" sound  (2)   Second Fat’hah vowel sign is an unwritten letter Nun saakin نْ that will produces “n” sound, Thus ﹰ will produce “an” sound. Fathatain generally follows by long vowel letter Alif ا.
example   بَنْ   will written as   ﺑً   will sound as "ban".

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