What is the definition of Rd2?

"RD2, my friend, is like the ultimate digital riddle. It's the mysterious transformation of 'R' to 'D' in a text message or an email, like this: 'R2d2' becomes 'D2r2' in a way that's both hilariously absurd and eerily unsettling.

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Now, here's an edgy sentence using it: "The cryptic message 'RD2' slipped across my screen like a digital ghost, sending shivers down my spine and leading me to unravel a mystery I'd rather forget.""