However, you might be thinking about one of these related concepts:
* Transitional sentence: This is a sentence that helps connect ideas between paragraphs or sections of writing. It usually summarizes the previous point and introduces the next one.
* Transitional phrase: Similar to a transitional sentence, but a shorter phrase used to connect ideas within a paragraph or sentence.
* Sentence with a transient subject: This is a sentence where the subject of the sentence is temporary or fleeting. For example: "A gust of wind blew through the leaves."
If you can provide more context about what you're looking for, I might be able to give you a more specific answer.