Terms such as:
heading, subheading, table of contents, glossary, index, maps, graphs, time line, photos, captions, title, biography, real, bolded print, italics, labels, read to learn, factual information, written to inform, and sidebar.
There are 5 pages of cards. Print enough for each student to have one. Laminate or put in plastic sleeves.
(You will need to create a call sheet, or just print an extra for yourself!)