What is the locus of a map?

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  1. What is the locus of a map? I search the definition of locus in the Wikipedia, it explains the locus as follows:

    In geometry, a locus is a set of all points , whose location satisfies or is determined by one or more specified conditions.

    So, what is the locus of a map?

  2. Further more, what is the meaning of the sign $\mathbb{N}^r$?

    Thanks!