 The acronym "UNA" spells out the Filipino word for "first".The Pwersa ng Masang Pilipino (PMP), headed by former president Joseph Estrada, and the Partido Demokratiko Pilipino-Lakas ng Bayan (PDP-Laban), headed by Vice President Jejomar Binay, signed a coalition agreement on April 4, 2012 for the 2013 elections, forming the United Nationalist Alliance (UNA).The two parties had been partners in the United Opposition in the 2007 election, and Estrada and Binay were running mates during the 2010 presidential election.