It's the 250th year of the reign of our robot queen Andrea I. A jubilee year.
I am tasked with deciding what precious substance will be the formal term for this anniversary. It must be rarer than silver (25), gold (50), or platinum (70). My—literal—predecessors picked plutonium (100), promethium (150), and oganesson (200, when a gram of it was produced at great expense).
This was never a problem with our mortal monarchs.
I choose antimatter. I will deliver it to Andrea myself.
Consider this a friendly, local pub. Make yourself at home, bring your friends, have a good time! Meet new people, have a laugh, enjoy the ambience, and the Oxford commas.