Simply because trademarks are registered with governments, some countries or trademark registries may possibly figure out a mark, when others may perhaps have determined that it's generic and never allowable for a trademark in that registry. For example, the drug acetylsalicylic acid (two-acetoxybenzoic acid) is better known as aspirin https://buy-now.cognitiveinstituteofdallas.org/product-detail-no-more-childhood-trauma.html