＿(　_´ω`)_

The last six characters, _´ω`)_, are exactly the ending of ヾ(⌒(_´ω`)_, right down to the plain underscore after the closing parenthesis. The difference is everything in front of them: where that face puts ヾ(⌒ before its opening parenthesis, this one has a single ＿, the character Unicode names FULLWIDTH LOW LINE, and inside the parenthesis it adds an ideographic space before the underscore. That ideographic space is the only blank in the line, which holds no ordinary space at all, and ´ω` itself is just ACUTE ACCENT, the Greek small letter omega and GRAVE ACCENT, with no dots anywhere. On X it appeared six times in about two weeks, identical every time, straight after Japanese morning greetings such as おはようございます (ohayō gozaimasu, good morning). It suits the kind of day when you manage the greeting and then cannot bring yourself to start on a single thing.