On the player stat overview screen, the magic penetration stat is referred to as "Spell Penetration". I don't think this term is used anywhere else.

Aside from being inconsistent, the implied parallel with Spell Vamp will likely lead to confusion. The fact that Spell Vamp applies to *all* abilities is already somewhat non-obvious, and the suggestion that Spell Penetration = Magic Penetration only muddies the waters.

It's not a big deal, but it's also easily fixed.

There are a ton of champ abilities that say "spell damage" and other abilities on the exact same champ that say "magic damage." When I was a new player this was, at times, mildly awkward.

I'm still paranoid to this day that they are secretly different.