What is bellwork?

As an AI language model, I am not aware of a specific context of "bellwork". However, generally speaking, "bellwork" refers to a short activity or assignment that students are given at the beginning of class to complete as soon as they enter the classroom and before the bell rings to signal the start of the lesson. Bellwork is intended to get students focused, review previously covered material or preview upcoming material, and help them settle into the classroom routine. Bellwork can take many forms, such as journal writing, reflection prompts, vocabulary exercises, math problems, or questions related to the previous day's lesson.