Tapping the Temple with the Index Finger
You raise your hand to head level, bending it at the elbow, clenching your palm into a fist while keeping your index finger extended, and lightly tap your temple with it.
What does it mean?
1. It indicates the foolishness of a person, their actions or statements, limited understanding, or strange behaviour.
2. Criticism directed at someone: the gesture most often has an ironic undertone.
This gesture is considered quite harsh and offensive. It is almost never used in official settings or business communication. It is mainly used in informal communication among well‑acquainted interlocutors where frankness and irony are acceptable. However, even in such cases, it may be perceived as a direct insult — especially if the interlocutor is sensitive to criticism.