"Keel" is the correct spelling, but that's your stem. (STEM - in lower case
it looks a lot like STERN.)


The photo I saw showed the product applied to the keel as well as the stem.

Vertical (raked) portion = stem
Horizontal portion = keel

Or so I would say.

I think the name of the product is a "keel guard" and that's the source of the
OP's terminology. :-)