Numbers for iPhone: object
An object is any item you place on a sheet, including images (photos), text boxes, shapes, tables, and charts. To add an object to a sheet, tap in the toolbar, then tap one of the object buttons.
After you add an object, you can drag it to where you want it on the sheet, add content to it, and modify its appearance.
You can also place some objects (shapes, text boxes, images, videos, equations, and image galleries) inline with the text inside a shape or text box, so that they move with the text as you type.