Footnote

asterisk (*) or dagger (†) may also be used to point to footnotes. In documents like timetables many different symbols, as well as letters and numbers, may be used to refer the reader to particular footnotes.

In practice, especially in learned works, what are loosely called "footnotes" do not in fact appear at the foot of the particular page where the text to which they apply is printed, but are collected together, usually chapter by chapter, and appear as an appendix of notes at the end of the work.