INTERPOL

INTERPOL is an international organization charged with policing the number line, hence INTER from integer, and POL from police. Now INTERPOL often is busy with important matters, so it may be good to know how to distinguish a real number line from a fake one, such as those offered by scammers.

    1   2   3   4   5
    |---|---|---|---|--- ...

    1   2   cat 4   5
    |---|---|---|---|--- ...

However, it may be noted that scurrilous scientists may allow for some arbitrary symbol to stand in for another (the Cratylus dialogue contains more such nonesense) such that cat equals three, or whatever. Recall the old calculus adage to remember to add "plus cat".