The term 'Printer's Daggers' refers to the typographical symbols known as obelisks, which are represented by the letter 'O' with a crossbar at the top. Obelisks are used in printing and publishing to indicate a footnote, an endnote, or a reference to another source. They are also used to indicate a break in a sentence or a change in the typeface. The term 'Printer's Daggers' is derived from the shape of the symbol, which resembles a dagger.