"Hijab" or "ḥijāb" (/hɪˈdʒɑːb/, /hɪˈdʒæb/, /ˈhɪ.dʒæb/ or /hɛˈdʒɑːb/; Arabic: حجاب, pronounced [ħiˈdʒæːb] ~ [ħiˈɡæːb]) is a veil that covers the head and chest, which is particularly worn by a Muslim female beyond the age of puberty in the presence of adult males. It can further refer to any head, face or body covering worn by Muslim women that conforms to a certain standard of modesty. It not only refers to the physical body covering, but also embodies a metaphysical dimension, where al-hijab refers to "the veil which separates man or the world from God”. Hijab can also be used to refer to the seclusion of women from men in the public sphere. Most often, it is worn by Muslim women as a symbol of modesty, privacy and morality.
More information: http://en.wikipedia.org/wiki/Hijab