The "Σ(゜ロ゜; )" emote, also known as the "Square Mouth Surprised" emote, is a Japanese emoticon used to express shock or surprise. It consists of the characters "Σ" for the eyebrows, "(゜ロ゜)" for the eyes and nose, and ";" for the mouth. The raised eyebrows and wide-open eyes convey a sense of astonishment, while the square mouth adds to the overall expression of shock.