I think it might be called a phrase.
Answer:
Key Points
1. Freewriting is writing without editing in order to get your ideas flowing.
2. Freewriting can be a useful prewriting technique to help think of different directions your paper can take.
3. To freewrite, get a pen and paper (or open up a blank computer document) and set yourself a time
Https://writing.colostate.edu/textbooks/informedwriter/chapter4.pdf