The Porunga reference article from the English Wikipedia on 24-Apr-2004
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Porunga

Porunga is a dragon character in the Dragon Ball Z Anime cartoon series.

Porunga is the eternal dragon of Namek summoned when all the dragonballs of Namek are gathered. He is more brutal looking than the dragon of Earth, Shenron.

He is also somewhat stronger and can grant three wishes instead of one, so long as it doesn’t exceed his creators power or his creator dies. However, the first Porunga had ability to bring only one person back to life instead of the unspecified number by Shenron. Later, Porunga's power is strengthened to bring back as many life as possible, which ancient Kai comments as "a blasphermous act that disrupt the order of the nature". Porunga can also listen to wishes made only in the Namekian language.

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