Scientists are continually developing larger and larger numbers to describe increasingly vast quantities they are measuring. New prefixes like zetta and yotta have been added to the International System of Units to name numbers with 21 and 24 zeroes. However, some scientists now want a prefix for a number with 27 zeroes, which is a thousand trillion trillion. A student has started a Facebook petition to have "hella" officially recognized as this prefix, though it is unlikely to succeed since naming committees prefer classical roots over American slang terms. The article concludes by saying readers could still find the idea of a "hellametre" appealing and could sign the petition in support.