The "\ (° _o) / ¯" emote or "I don't know that" emote is a combination of characters used to convey confusion, uncertainty, or ignorance. The raised arms and tilted head suggest a shrugging motion, while the raised eyebrows and open mouth indicate surprise or bewilderment. It is often used in online communication, particularly in chat rooms or forums, to express a lack of knowledge or understanding on a particular topic.