Royal Monogram of Vajiravudh "RR.6" (Rama, Ramadhipati 6th), as appeared on the badge and star of  the Knight Grand Cordon (Special Class) of the Most Noble Order of the Crown of Thailand "Maha Vajiramongkut".
File:Orde van de Kroon van Thailand Grootkruis aan lint.jpg
Original design by HRH Prince Narisara Nuvadtivongse, tracing into SVG format by user:Xiengyod~commonswiki.