Yelg melon

From Memory Alpha, the free Star Trek reference

A yelg melon is a type of fruit native to the planet Gaia.

In a math problem, proposed to the students of Gaia, the teacher wanted to know how many juicy yelg melons could be planted on twenty-seven tessipates of land, if melon required one square kerripate to grow in. (DS9: "Children of Time")