Ambiguity

If someone is speaking with ambiguity it means that they are speaking in an unclear or vague manner. There is uncertainty and doubtfulness in the meaning of what they're talking or writing about. 

This picture is stating that when something has ambiguity, it is very vague and unclear.

The image above shows a scenario where ambiguity comes to play. It can be used to be misleading.

This picture is an example of ambiguity. It is unclear and can cause confusion on what the sign is trying to say.