A head shaking side to side: no. It disagrees, refuses or shows disbelief.
Works as a gentle, wordless no, or as โI can't believe thisโ when someone hears something absurd. The small smile keeps it softer than a flat refusal.
It combines ๐ with โ๏ธ; where the motion version is missing, the face and the arrow show up as two separate emoji.
Facts
Head shaking horizontally ๐โโ๏ธ is an emoji in the smileys and emotion category, under face neutral skeptical. It became part of the emoji standard in Emoji 15.1, released in 2023. It is a sequence that joins ๐ slightly smiling face and โ๏ธ left-right arrow. Devices that do not know the sequence show those emoji side by side. On GitHub, Slack and other apps you can type it as :head_shaking_horizontally:. People also look for it with words like โheadโ, โhorizontallyโ, โnoโ, or โshakeโ.