Ik Oṅkār, written with the numeral one and the sign for Oṅkār, opens the Mūl Mantar and the Guru Granth Sahib. It declares that reality is one and that the One is the source of all. The Mūl Mantar continues by calling God truth by name, the creator, without fear or enmity, timeless, unborn and self-existent.
Ik Oṅkār
“One Being”: the opening of the Sikh scripture, affirming the oneness of the Creator.
Also: Ik Onkar, Ek Onkar