This is incorrect. The casing has nothing to do with being British. Until some time ago, it was ARM proper, whilst still being British. Although, the name was a

This is incorrect. The casing has nothing to do with being British. Until some time ago, it was ARM proper, whilst still being British. Although, the name was an initialism of 'Acorn RISC Machines', they later went by just the name, without any connotation to its origins. Some time ago, the management decided that the branding wasn't hip enough, and went for a rebranding (website, social media etc.), with lower case arm used in documents and as logo. But when used as a noun, they use Arm instead. Source: I used to work there when this happened.