Reading the international signs
The international signs are written by signograms, that are very easy to read and understand how to do the sign by yourself. The signograms are made by three kind of lines, that bear the following information:
Position and point of view
Look here for more explanations with images: http://poesiamerica.yogote.net/index.php?option=com_content&view=article&id=127&Itemid=89
Form of the hand
More explanations here: http://poesiamerica.yogote.net/index.php?option=com_content&view=article&id=128&Itemid=90
Movement
Explanations with animation and video: http://poesiamerica.yogote.net/index.php?option=com_content&view=article&id=128&Itemid=90