Alif
The Century Dictionary and Cyclopedia
noun.
The first letter of the Persian (Arabic) alphabet, consisting of a single stroke: hence, a mere letter; a jot.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
The first letter of the Arabic alphabet:
ا
('álif).
Word Usage
"This usage occurs only at the beginning of a word, since within a word alif always sounds like the long vowel "aa.""