This iconic image from the 1989 Tiananmen Square protests in Beijing, China captures the moment of a lone man standing in front of a column of tanks. The image has become a symbol of peaceful resistance and has been used to represent the power of the individual in the face of oppressive regimes.
From Wikipedia
Tank Man is an unidentified individual, presumed to be a Chinese man, who stood in front of a column of Type 59 tanks on Chang'an Avenue near Tiananmen Square in Beijing on June 5, 1989. The confrontation occurred one day after the government of China forcibly cleared the square following six weeks of pro-democracy demonstrations, resulting in the deaths of hundreds of people, primarily in areas surrounding the square.