The General Chiropractic Council (the regulatory body for Chiropractic in the UK) has issued the above logo to make it easy for Chiropractors like me to show that they are properly registered.
It is actually a criminal offence to call yourself a ‘Chiropractor’ in the UK unless you are on the GCC register. Registration shows that somebody has completed the appropriate training and has complied with the requirements for keeping their skills and knowledge up to date.
You can check whether somebody is registered by visiting the website in the logo.