Supporter flags are a point of identification for supporters of a team or athlete. The use of the flags is thought to be for identification purposes, in order to help with communication between different sets of fans. Supporters tend to wear their flags at home matches and bring them with them when travelling abroad, where they are often used as a sign of support during both group and individual matches.
These supporter flags are also used by supporters during anti-racism protests. Some supporters are making more creative versions that have political or even personal messages on them.