This petition is to make hella- the official prefix for 10^27, or x,000,000,000,000,000,000,000,000,000. Currently the official 10^24 is yotta-, as in yottameters, or yottanewtons. According to the petition:
For example, the number of atoms in 120 kg of carbon-12 would be simplified from 6,000 yottaatoms to 6 hellaatoms. Similarly, the sun (mass of 2.2 hellatons) would release [...]