At the back of every igloo

and the middle of the moon
Always running around in loops you'll find me
If you look inside the room
What am I?

Which letter of the alphabet answers this question?

The letter "O"

To figure out which letter of the alphabet answers this question, we need to analyze the given clues.

The clues mention the back of an igloo, the middle of the moon, and running around in loops. Additionally, we are asked to look inside a room for the answer.

By analyzing the clues, we can conclude that the answer is the letter "O".

In an igloo, the letter "O" is located at the back.

In the word "moon," the letter "O" is in the middle.

The phrase "running around in loops" suggests the letter "O" because it is a round shape that can be looped.

When we look "inside the room," we can find the letter "O" in various words like "door," "floor," or "window."

Therefore, the letter "O" is the answer to this question.