The roman numerals on her shoulder.
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A Guide To Rihanna’s Tattoos: Her 25 Inkings And What They Mean
18. The roman numerals on her shoulder.
In June 2008, Rihanna got the birthday of her best friend and manager, Melissa Forde, inked on her shoulder in Roman numerals. Forde got the same tattoo with Rihanna's birthday tattoed on her as well.