The signature is an element that systematically combines the symbol mark and logotype, the core components of the CI system, and is an official expression system that conveys GIS's image. Depending on the situation of the application medium, an appropriate layout should be selected and used.

Arbitrary changes to the proportions, spacing, or size of the signature can disrupt the consistency and image of the CI system, so the principle of proportional application of data must be followed when reproducing the original draft.