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"What have we got today?" Harry asked Ron as he poured sugar on his porridge.

"Double Potions with the Slytherins," said Ron. "Snape's Head of Slytherin House. They say he always favors them –– we'll be able to see if it's true."

–– Harry Potter and the Sorcerer's Stone

Double seems to mean two Houses together. When three houses together, do you use triple class?

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Double seems to mean two Houses together.

No, it refers to two hours of teaching.

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  • I couldn't see how this can mean two house (or two houses). Isn't a potion the same thing as an elixir? (I guess that Double Potion here might refer to something that twice as strong as a typical potion.)
    – Damkerng T.
    Commented Dec 10, 2013 at 11:26
  • Not exactly. This is Hogwarts, after all, and "Potions" is a subject being taught there. If they had two hours' worth of Divination, they'd call it "Double Divination", no doubt.
    – Ingmar
    Commented Dec 10, 2013 at 11:28
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    It is not necessarily two hours of teaching. A school day is timetabled into specific periods (at least, my school called them periods... my daughter's school calls them blocks). I have known schools with 35-minute periods and others with periods over an hour. Most lessons will occupy one period, but there will be double periods for some subjects. I imagine the shorter the basic period/block, the more "doubles" there will be in the timetable.
    – toandfro
    Commented Dec 10, 2013 at 20:41

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