Doing ^J

Hi, I am reading the book "learning vi editor"(linda lamb & arnold robbins 6th edition).
Page 115, the book does a command like this:

:map ^J xyz

The xyz part itself doesnt matter here, my problem is to make the "^J" part.

I have tried
Ctrl+V Ctrl+j (ctrl+v can be used to escape Enter for example)
and
Ctrl+j directly

In both cases it doesn't work.

I am using vi editor inside FreeBSD 11.0, it isn't the vim (vi improved) but I thought that I could ask here because both (unix vi and vim) are similar.

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