Oesho was a deity represented on the coins of several Kushan kings, and was apparently one of the titular deities of the dynasty.
The deity is identical with Shiva (I'sha), and "Oesho" would just be the pronunciation of Shiva's name in the Bactrian language of the Kushans. The deity is shown to depict him holding a Trishul or Trident with a Bull often identified with Nandi.
Similarities with Hindu Deity Dattatreya
The image/iconography of Kushan deity Oesho closely resembles that of Hindu Deity Dattatreya, who gain prominence in early medieval period.