Also known as 'Vaheguru', 'Waheguru', 'Vaaheguroo'. The 'Sanatan' (traditional) Sikh designation for the one Primordial Eternal Wonderous Supreme Being. The term is derived from various designations of this 'One' being from the various 'Yuga' (ages of cyclic time as per Indian ideology):
'V' - from Vishnu (Sat Yuga)
'H' - from Hari (Treta Yuga)
'G' - from Gobind (Kal Yuga)
'R' - from Rama (Dwapur Yuga)

Also see 'Yuga'.