It's possible you might be thinking of one of these related concepts:
* Intensive pronoun: These pronouns emphasize the noun or pronoun they refer to. Examples: *myself*, *yourself*, *himself*, *herself*, *itself*, *ourselves*, *yourselves*, *themselves*.
* Intensifier: Words that strengthen the meaning of another word, usually an adjective or adverb. Examples: *very*, *extremely*, *really*, *absolutely*.
* Sentence with emphasis: A sentence that uses specific techniques to emphasize a particular word or phrase. This can be achieved through word order, punctuation, or other stylistic choices.
For example:
* Intensive Pronoun: "I did it myself."
* Intensifier: "It was extremely hot."
* Sentence with Emphasis: "Never will I forget that day."
If you can provide more context about what you're referring to, I can offer a more specific explanation.