Learn more about Tanzania Cultural Gestures at this site. Many visitors to Tanzania gestures haphazardly and this site takes this opportunity to teach you how to gesture in a Tanzanian style.
• When gesturing or beckoning for someone to come, you should face your palm downwards and make a scratching motion with the fingers. It is considered very rude to beckon someone with the palm up. That is reserved for animals.
• Pointing to a person with one finger is generally considered rude (although it is sometimes unavoidable). It's best to point with the whole hand or in a slightly more vague manner.