Adobe Acrobat 7 Professional - Manual (Page 388)

Creating figures
You can select an element and define it as a figure by using the TouchUp Reading Order
tool. Once you define it as a figure, you can add alternate text to describe the figure.
If a tagged image in the document doesn't contain useful or illustrative information for the
user, you can remove the element from the tagging structure so that it isn't read out loud or
reflowed. (See
Removing page artifacts and elements .) If a character within a text block is
incorrectly tagged as a figure (such as an ellipse or decorative letter of the alphabet), you
can remove the Figure tag by selecting the entire text block and clicking Text.