Analysis of information sources in references of the Wikipedia article "Ik Onkar" in English language version.
On the other hand, Nanak refers to God as Onkar, 'the expression of Om', that is, of the sacred syllable of the Hindus, a conception that actively continues as Ik Onkar, 'the one om expression'.
Oankar corresponds to the Sanskrit term Om.....Guru Nanak, the founder of the Sikh tradition, wrote a long composition entitled "Oankar", in which he attributed the origin and sense of speech to the Divinity, who is thus the "Om Maker"
It is the diagram that emerges when the first two words of the Adi Granth-words attributed to Nanak-are written together in Punjabi script. The words are ek omkar- "1 Omkar" or simply "1 OM"- and they are almost always interpreted as meaning that God, who is signified by the mysterious syllable OM, is one.
the 'a,' 'u,' and 'm' of aum have also been explained as signifying the three principles of creation, sustenance and annihilation. ... aumkār in relation to existence implies plurality, ... but its substitute Ekonkar definitely implies singularity in spite of the seeming multiplicity of existence. ...