Paralympic logo on Tower Bridge

From Wikipedia -

The symbol of the Paralympic Games is composed of three "agitos", coloured red, blue, and green, encircling a single point, on a white field. The agito ("I move" in Latin) is a symbol of movement in the shape of an asymmetrical crescent. The Paralympic symbol was created by the Scholz & Friends agency and approved in April 2003.[1][2]

The colours of the agitos with the white background stand for the three colours that are most widely represented in national flags around the world. The three agitos encircle a centre point, to emphasize "the role that the International Paralympic Committee (IPC) has of bringing athletes from all corners of the world together and enabling them to compete". The shape also symbolises the Paralympic vision "To Enable Paralympic Athletes to Achieve Sporting Excellence and to Inspire and Excite the World".[1][2]