What is the last marker on a Chalice Dungeon description?

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What is the marker I circled? I know the Depth is the difficulty and the Area is obviously the area. But the circled mark can go up to 5 (but might go higher) and I am not quite sure what it means.
My guess is number of bonus rooms or rarity?
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What is the hardest chalice dungeon?
Bloodborne: 10 Most Difficult Chalice Dungeon Areas, RankedAre the chalice dungeons infinite?
Chalice Dungeons are an interesting mechanic in Bloodborne. Generally speaking they're dungeons that can be created by the player to be infinitely run for fun, as a reward, or as a challenge.How many layers does a chalice dungeon have?
Layers. Including the Short Ritual Root Chalice, there are a total of twenty-six Chalices. There are a total of thirty-five named Chalice Dungeons. Each dungeon consists of labyrinth-like "Layers," with a boss at the end of each layer.What is the final chalice dungeon?
The final unique Chalice Dungeon is the Great Pthumeru Ihyll Chalice \u2014 get to Layer 3 here to fight a creature that's very important to the game's complicated lore.Chalice Dungeons 101
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