What does OP stand for?

Optimus Prime (Leader of the Autobots, icon of the 80s)

This definition appears very rarely

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Samples in periodicals archive:

35 Optimus Prime S J Hassett/Adrian Maguire (14/62, +[pounds sterling]6.

PERFECT PARTNERS: 4.35 Lucy Stone [...]

Paco Jack reappeared later that week to win the Galway Blazers and, more recently, again showed his liking for Ballybrit when defeating Optimus Prime.

DAVY TAS ENOUGH TO BE MAN; IRISH RACING NATIONAL PREVIEW

Paco Jack stretched clear under Robert Power on the long run-in to account for Optimus Prime by five lengths.

National bid next up for Paco Jack; GALWAY

In the intervening period, humankind has forged an alliance with Autobot leader Optimus Prime (Cullen) to create a top-secret military division known as NEST, which hunts down the last remaining Decepticons.

Rampaging robots save earth again; feature the main: TRANSFORMERS: ...

Humans have linked with Autobot leader Optimus Prime (Peter Cullen) to create NEST, a top-secret military division.

the brutalising, non-stop spectacle of it; BigMovie: Robots go on the ...

Last time out, high school student Sam Witwicky (Shia LaBeouf) and his Autobot friends defeated power-hungry Megatron (voiced by Hugo Weaving) and the Decepticons, and the humans are now working with Autobot leader Optimus Prime (Peter Cullen) in a secret military division.

More metal mayhem; The robots may be bigger and better in this epic ...

Decepticons return for apocalyptic showdown; Transformers: Revenge of ...

Optimus Prime has always been the leading good guy and Megatron the leading bad guy.

`Transformers' toys live up to big-screen robots