What is Rank?

I’ve found the wiki on wikia dungeonquest.wikia.com/wiki/Dictionnary, and several of the items talk about “per rank”.

For example, electrified says “Reflect DMG is added to attacks, is applied to all surrounding enemies, and is increased by 50% per rank”. Is “rank” the (1) in front of (1 )Spell Sword or something else?

Yes, that’s the number after set affix, like Rage (2)