Consistent use of reference signs in the description, claims and drawings 

Reference signs must be used in a manner which is consistent in the description, claims and drawings. In particular, reference signs not mentioned in the description must not appear in the drawings, and vice versa.

R. 11.13(l), (n)
PCT AG I 5.154

A feature denoted by a reference sign must be denoted by the same sign throughout the international application.

R. 11.13(m)
PCT AG I 5.155

In the case of international applications dealing with complex subjects and incorporating a large number of drawings, a separate sheet listing all the reference signs should be included at the end of the description as a part of it.

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