This is the 2293rd most frequent Arabic word.
الف
"الف" means "thousand" in English.
Here, 'ألف' is used as a numeral meaning 'one thousand,' referring to the title of the book.
أحببت كتاب ألف ليلة وليلة.
I liked the book 'One Thousand and One Nights.'
In this context, 'ألف' denotes a quantity, specifying the number of people gathered.
جمع ألف من الناس في الساحة.
A thousand people gathered in the square.
'ألف' is used here both numerically ('one thousand') and phonetically (referring to the Arabic letter 'Aleph').