Section 10
The signs  and 
The cross ( ) is very often used to indicate a particular part of a picto. For instance, to mean the chimney of a house, we put a cross as close to the chimney as we can.
When the picto does not allow room enough and we want to be precise, we may use the sign .
Examples:
Section 11
Impossible and Possible
Impossible is a glass of water drawn in an upside down position and in which the water remains in the glass. So we have:
Impossible: 
By using contrast, we arrive at the picto Possible: 
Section 12
Weak and Strong
Contrast allows us to represent these concepts in a very simple
manner. We choose the picto Table  and have:
Strong may also be written simply as: 
A man with wide shoulders also means Strong: 
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