drawing board

/D R AO1 IH0 NG B AO1 R D/
noun
  1. 1

    A plane surface or table to which paper can be fastened for drawing purposes.

  2. 2

    The planning stage of a project.

    โ€œWe'll need to go back to the drawing board to figure out where the project went wrong.โ€

Source: https://en.wiktionary.org/wiki/drawing%20board