An acrostic poem is a form of poetry where the first letter of each line spells out a word or phrase vertically. The lines of an acrostic poem should relate to and describe the topic word. An example is provided where the letters in the word "SUN" are used to start each line describing the sun. Students are instructed to choose a topic, brainstorm descriptive words using a graphic organizer, then write an acrostic poem using the organizer as a prewriting exercise.