Nonverbal communication, as its name implies, is the transference of information, in this case from one person to another, without the use of sounds or verbiage. This is one of the primitive ways of communication, as our bodies often tend to provide more information through our mannerisms, gestures, and expressions than our words can.
There are a myriad of different ways to use non-verbal communication, from everyday gestures of endearment, to even specific signs done in sports, such as baseball. There are specific tenets that accompany nonverbal communication: a) it is culturally-specific, b) cues are used to transfer attitudes and emotions, c) are continuous, d) are more reliable than words.
To call someone (I assume you refer to getting someone's attention to go meet you somewhere else), the most common non-verbal signs may vary from culture to culture. In some cultures, eye to eye connections are not allowed, so let's assume that we are talking about Western non-verbal traditions.
-By moving or waving your hand signaling closeness (to bring the person over to where you are)
-By using your eyes in a firm and authoritative way, and use them to signal a different location.
-By moving your entire head and eyes signaling a separate location
-By using your lips or another part of your body to signal a separate location.
Sometimes proxemics (the use of personal space) could actually also be used to call someone's attention. For example, when someone removes themselves from someone else's already-created personal space, or close proximity, it can cause a call for someone's attention, as they will question the motive for one's removal from someone else's proximal distance.
Most people create their own signals to establish nonverbal cues that can help them tell each other things without saying any words. This is what shows that nonverbal communication is more than just alternative language, but also a symptom of the human need for transferring thoughts and emotions in more ways than one.