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It's called a Bindi. It's a form of decoration/make-up very common in India.

Thank you.I Got the answer from the link. it is a religious tradition in India. in My country, we could see some bindi like thing at the Buddhism portrait.

Indian culture "Bindi" more you can search about it on google.

A bindi is a colored dot worn on the centre of the forehead, commonly by Hindu and Jain women. The word bindu dates back to the hymn of creation known as Nasadiya Sukta in the Rigveda.Bindu is considered the point at which creation begins and may become unity. It is also described as "the sacred symbol of the cosmos in its unmanifested state". A bindi is a bright dot of some colour applied in the centre of the forehead close to the eyebrows worn in the South Asia particularly in India.