Definition of a lot

Oklahoma Mineral Rights Hughes County, OK
1

Could some clarify this legal description for me, NE/4 SW/4 and lot 3. What is lot 3?

2

http://jay.law.ou.edu/faculty/Hampton/Mineral%20Title%20Examination/Spring%202012/Legal%20Land%20Descriptions%20in%20OK_Kletke.pdf