pulsar

This is a small Emacs package that automatically highlights the
current line after certain functions are invoked.  It can also
highlight a line or region on demand.  The idea is to make it
easier to find where the point is, what was affected, and also to
bring attention to something in a buffer.

Why the name "pulsar"?  It sounds like "pulse" and is a
recognisable word.  Though if you need a backronym, consider
"Pulsar Unquestionably Luminates, Strictly Absent the Radiation".