Is there a name for a section of text which is delimited by final punctuation, regardless of whether it is a sentence, clause, phrase or single word? In other words, a term that generalizes all of the following: "Really?", "A very large one!", "I wish I could have known...", "The quick brown fox jumped over the lazy dog."
All sections of text delimited by final punctuation are sentences. Merriam-Webster's definition of a sentence is "a word, clause, or phrase or a group of clauses or phrases forming a syntactic unit which expresses an assertion, a question, a command, a wish, an exclamation, or the performance of an action, that in writing usually begins with a capital letter and concludes with appropriate end punctuation, and that in speaking is distinguished by characteristic patterns of stress, pitch, and pauses" (https://www.merriam-webster.com/dictionary/sentence).