What does the HH, DR, stand for or mean?"

General Mineral Rights Discussion
1

In this drill permit. Dewey County REAY #1-36-1H, January 25 2017 01 18N 14W N2N2NENE API: 04323497 Lat: 36.0719928926364, Long: -98.63864317799889 COMANCHE EXPLORATION CO LLC. HH, DR, 14800 ft, MISSISSIPPI LIME(9800)