Adobe's SING architecture answers a requirement of "gaiji" for Japanese, Chinese, and Korean typography. The term "gaiji" is a Japanese word meaning "supplemental glyph" or "supplemental character." In this context, it means: Any character or glyph that is valid in your written language, but is not in the font you are using. The SING architecture provides a way for users to extend their fonts with individual new "glyphlets," representing variant glyph shapes, or symbols. These glyphlets are embedded in documents and can be used for editing at other points in the workflow.