Its the intials for the new press that the BEP started useing. Its capable of printing 50 note sheets. Right now its only printing 32 note sheets like the old presses. So to distinguish the notes the plate numbers on the SOI notes are larger. I believe they started printing some of the 2006 to present 20 dollar notes with them. There only used in BEP plant in Washington D.C.. Here is a link with some more info on them. I got the link from an older post by John1 in US Paper Money and Banknotes.
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