Thursday Morning Riddle

I am home to the new kids and Jenny’s proud song;
I help children build castles, but nothing too strong;
I’m the end of a question Ken Jennings got wrong;
And a way to tell actors just where they belong.

Who am I?

UPDATE: Riddle solved by DeLisa. See comments for answer.

3 Responses to “Thursday Morning Riddle”

  1. DeLisa Says:

    Block

  2. Bill Says:

    BLOCK is correct.

    Way to go, DeLisa!

  3. Bill Says:

    Honorable mention to my sister, who left a message on my voicemail.

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