Symbolism has long been established as a means for achieving social mobilisation. The protesters at the London G20 protest on April 1, 2009 employed a wide range of symbolism to kindle people's collective memory. This article studies visual protest symbolism through photographs taken at the protest and discusses six types of visual protest symbolism - costumes, effigies, flags, organisation banners, and slogans - that rely on people's collective memory to mobilise. The article treats the six types of protest symbols as cultural objects and evaluates them in relation to the dimensions of institutional retention, retrievability, rhetorical power, and …