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1. In most social situations where some informality is allowed, a   raise of the hand and a small wave is fine. For instance, if you are walking across the   and see your teacher approaching you, a small   wave to attract his or her attention is appropriate.
Once you′ve got your friend′s attention, you shouldn′t point at the person or thing you want her to look at. A slight nod will do. Pointing at someone is usually considered  . Of course, there are times when pointing is   acceptable, such as when a teacher wants to get someone′s attention in class. The teacher   points to the student and says, “David, would you read the next sentence, please?” Pointing here is not impolite; it′s   a way to get someone′s attention.