ridge pole

/R IH1 JH P OW0 L/
noun
  1. 1

    A beam along the ridge of a roof to which the rafters are attached.

  2. 2

    A horizontal pole that supports the roof of a ridge tent

Source: https://en.wiktionary.org/wiki/ridge%20pole, https://en.wiktionary.org/wiki/ridgepole