gPPAY stands for vote-escrowed PPAY, it is simply PPAY locked for a period of time (from 1 day to 5 years). The longer you will lock PPAY for, the more gPPAY tokens you receive. For a 5-year max lock, you will receive the same amount of gPPAY voting tokens (1 PPAY = 1gPPAY). For a 1-month lock, you will receive: PPAY/(5*12)=0.016 gPPAY