"Where in the world?"
Recently a cousin asked what the "N" in my call
meant. Callsigns with W, K, N, or A in the prefix
indicates that the Amateur Radio Operator is in
the United States of America.
The numbers 0 through 9 usually indicate which
region of the United States that they live. For
example: the "4" region is the South East part of
of United States. Until a few years ago, if you
moved to another number region you were required
by the FCC to change your callsign but this rule
is no longer in effect and you may keep any call
that you will receive from the FCC or that you may
presently have for your lifetime.