Verified answer

HP means Halbpension, i.e., the price stated is for bed, breakfast, and lunch (in Germany, lunch is the main meal)

ÜF means Übernachtung und Frühstück, i.e., the price stated is for bed and breakfast.

Halbpension is the same as half board, that means bed, breakfast and one main meal - it can be either lunch or dinner.

I would like to ask the same question as the user above.

Have never thought about it that way