How much line to put on a Penn 210

What does a reel's size number actually mean? Is it not the recommended weight of the line? (Story in captions) : r/FishingForBeginners

The PENN Wrath was built around legendary PENN durability. Featuring a lightweight and corrosion resistant graphite body with a machined and anodized

PENN Wrath Spinning Inshore/Nearshore Fishing Reel, Size 6000

Penn Spinning Reel - Pursuit IV 6000 – Mondocat - Fish Big or Go Home

IDEAL 210 lbs. x 500 ft. Power-Fish Pull Line 31-348 - The Home Depot

How much line to put on a Penn 210

PENN BATTLE III SPIN REEL