Seals (`印章 - yìnzhāng`) hold immense cultural and legal weight in China, a tradition stretching back to the imperial dynasties. A seal, not a signature, has historically been the ultimate symbol of authority and authenticity. While a signature can be forged, a company's official seal is a unique, registered instrument whose use is strictly controlled.
This system reflects the state's central role in regulating commerce and taxation. The strict requirements for the seal's format (oval shape, specific font size, inclusion of the tax ID number) ensure uniformity and make fraud more difficult, embodying a bureaucratic culture that prioritizes state oversight and documentation over individual convenience.
The `发票章` is encountered constantly in professional life in China.