Consecration issue, coin struck under Marcus Aurelius, 162 AD (Antoninus Pius died 161 AD). With consecration Antoninus Pius got posthumously elevated among the gods.
The first consecration was under was Augustus, who had his adoptive father consecrated. It soon became the custom in the Roman Empire for emperors to have their predecessors elevated to divus "god" status by the Senate, provided they considered them legitimate. Certainly not (always) for religious reasons