7.5.2
Arrows 

Arrows may be used at the end of the reference lines provided that their meaning is clear.

PCT AG I 5.146

– 
A free-standing arrow indicates the entire section towards which it points. 
– 
An arrow touching a line indicates the surface shown by the line looking along the direction of the arrow. 
– 
Arrows may also be used in appropriate cases to show the direction of movement. 

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