Signs indicating identity, services and other information. The logo on the sleeve of a police uniform is an armband, which is worn by police, soldiers and self-employed people at the upper arm of the sleeve of a coat to show their identity, service and other information. Generally worn on the left arm, the shape is shield, rectangle, diamond and so on. Generally, it is a computer embroidery product. Police uniform refers to the uniform of all police officers, which is an important symbol of police identity and law enforcement, and reflects the police style of a country.