I think it stands for preliminary estimate.
Also, if we added 114,000 jobs but the unemployment number went down 456,000 where did the other 342,000 go?
THE EMPLOYMENT SITUATION -- SEPTEMBER 2012
The unemployment rate decreased to 7.8 percent in September, and total nonfarm payroll employment rose by 114,000, the U.S. Bureau of Labor Statistics reported today. Employment increased in health care and in transportation and warehousing but changed little in most other major industries.
Household Survey Data
The unemployment rate declined by 0.3 percentage point to 7.8 percent in September. For the first 8 months of the year, the rate held within a narrow range of 8.1 and 8.3 percent. The number of unemployed persons, at 12.1 million, decreased by 456,000 in September. (See table A-1.)