It symbolize the third eye or mind's eye, that is associated with the idea of meditation and spiritual enlightenment.
Wearing it on the forehead is believed to harness energy and increase concentration. Wearing black bindi is to ward off negativity. Indian culture, buddhism,Islam, other religion and practises (contain signs and symbols) ~  answers and unfolds the veil that Allah put forth for human to seek the true path !!
 Look around,ask with your heart,the symbols dressed by us, others ,be it of different races,would guide you to Allah. (Al Kawthar ~  terletak di antara dua kening), ~ cantiknya mata,indahnya kening, heningnya Al KawtharMu !!
Terima kasih Allah....raikan cinta