ShapeRange.Title Property (Word)
Returns or sets a String that contains a title for the shapes in the specified shape range. Read/write.
Use the Title property to provide an alternative text title for a shape. This property adds title text to the Title text box on the Alt Text pane of the Format Shape dialog in Word 2010.
Web browsers display alternative text while tables are loading or if they are missing. Web search engines use the alternative text to help find Web pages. Alternative text is also used to assist disabilities.