The idea of the movable font evolved from ancient practice. The old method is to engrave the whole word or the whole sentence on the wood board, and apply the ink on the appropriate plane to leave a clear mark. The medieval kings and princes often engraved their signatures on wood or metal plates for ease of use in signing, sealing, or licensing. As early as the 12th century, similar engravings were used to copy pictures and handwriting from woodblock stamping, to engraving letters on many small wooden blocks or small metal blocks, and then arranged in the required order for Printing is a natural but slow-moving step. The active font is better than the largest woodblock. As long as the fonts are rearranged, you can complete the unlimited printing work.