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So I'm building the MTO Heroes of the First Company terminators & I noticed these arrows markings on the bottoms of thier bases.

Each base has them, but none of them are the same pattern.

Anyone know what they're for?

Batch markers.

Well, batch numbers is one way to say it. In my company we call them lot numbers. Those are number dials that can be turned so that each lot/batch can be tracked, if a defect is found in something the whole batch/lot can be quarantined to check for the problem.

Sometimes there's a pattern of.. the day/month/year it was manufactured and the lot/batch made for that day, like 1st batch, 2nd batch, 3rd batch, etc