British vs American English
There are numerous spelling differences between British English (as spoken and written in the United Kingdom and the Commonwealth) and American English (as spoken and written in the United States and Canada). Although Radiopaedia initially favored UK spelling (on account of having been started in Australia) we now accept having a mix of British (UK) and American (US) spelling on the site.
The site now automatically attempts to show users the correct spelling. This is based on your browser language setting. Additionally, your user profile settings include a language preference which over-rides the browser language setting.
Only a defined set of words will be translated and not all parts of the site will be affected.
Also, if you follow a link shared with you that has a specific language appended to the end of the URL, e.g. ?lang=gb you will be shown that spelling and not the one favored by your browser/user profile.