The kero symbol held by a Personage with staffs carved on the Stone Receptacle from Offerings No. 1 found in the Semi-subterranean Temple at Tiwanaku. Note the kero image, seemingly turned sideways, in the staff held in the left hand, just above the thumb.
Isbell, William H.; Uribe, Mauricio I.; Tiballi, Anne; Edward P. Zegarra, 2018, "Visual database", https://doi.org/10.25346/S6/1B33FN.