Question: Which letter appears in a small circle after a trade-name to prove that the trade name is a registered trademark
Answer: 🄡; 🅁; Ｒ; 🆁; Ʀ; ⒭; 🅡; Vōx Canīna; R (letter); Vox Canina; Ʀ (letter); R; Ar (letter)