An obscene gesture is a movement or position of the body, especially of the hands or arms, that is considered exceedingly offensive or vulgar in some particular cultures. Such gestures are often sexually suggestive. Although " the finger " has been called "the universal sign of disrespect",  it is not truly universal. Many other gestures are used in addition to, or in lieu of, the finger in various parts of the world to express the same sentiment.
The world of Russian folk gestures
Russian gestures | Travel | The Guardian
Russians believe their pofig- ism is a special kind. In certain circumstances, Russians are not all that bothered by disasters, meteors and crisis. They take matters in stride. The root of the word pofig is fig , derived from the fruit that should be eaten in limited amounts, when ripe. The word has branched out, becoming a bad word over the centuries. It has a long historical lineage, dating back to ancient Greece and Rome when a fig was thought to represent fertility, eroticism and parts of the female anatomy about which Russians have knowledge without necessarily discussing the matter on web sites devoted to the knowledge Russians have.
A Russian person scratches the back of his head when he is concerned about something. But why? Probably not to stimulate circulation in the brain. One version says that the gesture comes from folk magic: Their ancestors scratched the backs of their heads in order to summon the help of a primogenitor, a genius of mankind. Drawing by Tatiana Perelygina.