The DNA material located in the nucleus of a cell is known as chromatin.

Here's why:

* Chromatin is the complex of DNA and proteins that makes up chromosomes. It's essentially the "packaging" for the DNA.

* Chromosomes are the thread-like structures that carry genetic information.

* The nucleus is the control center of the cell and houses the genetic material (DNA).

So, while DNA is the actual genetic material, it's the organized structure of DNA within the nucleus, along with its associated proteins, that we call chromatin.