Formal:
* Peroration: This is the most formal and traditional term for the concluding part of a speech.
* Closure: A more general term that simply indicates the end of the speech.
Informal:
* Ending: A straightforward and widely understood term.
* Wrap-up: This suggests a brief and concise summary of the main points.
* Call to action: This is used when the conclusion aims to motivate the audience to take action.
* Final thought: This emphasizes that the conclusion offers a lasting impression or reflection.
Ultimately, the best name for the conclusion of a speech depends on the specific context and the speaker's style.