One hand is holding a circle (chakra) of light, one holding a conch shell for the inner sound (hold it to the ear and a sound is heard), one holding a lotus flower to refer to nectar, and finally the fourth hand is holding a metal club (mace) for the inner vibration (if you hit something with it, it vibrates like a tuning fork). Some people refer to this inner energy as the soul. Two of the names above were changed. Below the same paragraph is written again with the new names based on Wikipedia sources. The ten Sikh Satgurus talk about the inner sound and inner light a lot in their scriptures. The first Sikh Satguru was Sri Guru Nanak Dev Ji, but people believe his master was Waheguru. However, according to history during the True merchandise(ਸਚਾ ਸਉਦਾ) Guru Nanak Dev Ji, interacted with some living masters and term Waheguru is a combination of two words that is Wahh and Guru. Wahh is the praise (i.e awesome or wonderful), Guru means a teacher, full expression is "Satt Naam WahhGuru" which means "Oh Wonderful teacher, Naam or Word is the truth." Wikipedia says: "Kabir's early life is not firmly established.[7]:14 In Indian tradition, he is commonly supposed to have lived for 120 years from 1398 to 1518, which "permits him to be associated with other famous figures such as Guru Nanak."But none of this is written anywhere or proved yet both personalities used Gurmukhi for writing 'Bani'. THE LINE OF SUCCESSION FROM KABIR TO PRESENT   From Kabir to present, the Masters of the Divine Science of Light and Sound appear and manifest themselves as an uninterrupted line, through which they transmitted to each successor the one knowledge and the one Power. Subsequently, we can trace an  exact "family tree" from Kabir Sahib (1398-1518) to Sri Guru Nanak Dev Ji (1469-1539) and further as shown below:  ਹੁਕਮੁ ਪਛਾਨੈ ਸੁ ਏਕੋ ਜਾਨੈ ਬੰਦਾ ਕਹੀਐ ਸੋਈ॥੩॥ (GGSG-Page No.1350-3)...Saint Kabir  Translation: One who will recognize the Command (Hukam), will know One Lord, we call him the real man.