Manuscript Preparation, Copyediting, and Proofreading
Q. What is a callout?
A. A callout tells a typesetter where to place a figure. The callout itself is not meant to appear in type, so it has to be flagged somehow as a nonprinting instruction—for instance, <!Fig. 1 near here!>. You can find this in CMOS at 2.27 by typing “callout” into the Search box or looking under “callout” in the index.