What was the Huang written language?

There's no historical record or evidence of a "Huang" written language. It's possible you're thinking of:

* The Huangdi (Yellow Emperor): A legendary figure in Chinese history, often credited with introducing writing to China. However, the earliest known writing in China predates him by centuries.

* The "Huang" as a part of a different term: It's possible you're misremembering a term or a historical reference that includes "Huang".

Could you please provide more context or details about what you're referring to? Perhaps you're thinking of a specific historical period, a culture, or a specific script?