Meaning
A face with a raised eyebrow, looking up or aside, with a hand resting on its chin. It is the universal sign for “hmm”: considering an idea, weighing options, or quietly doubting what you just heard.
It works for genuine pondering, like “Pizza or pho tonight 🤔”, and for gentle skepticism when a claim sounds off. That second use is where trouble starts: dropped alone under someone’s statement, it can suggest you think they are wrong or lying. If you are truly unsure rather than suspicious, a short question alongside it keeps things friendly.