[Timber Rattler]

Local gang probably.

[Captain Rhino]

You are correct; NNH 804 = Richmond Crips

http://www.corrections.com/news/article/22428-bloods-more-gang-knowledge

“These are some of your universal blood tattoos. Below I will give examples of numbers and letters that will specify an area, a specific set and codes used by blood gang members.

...

•804 - Virginia Area Code (Richmond Area)
...

•Nappy Heads for the Neighborhood Crips”