The term HHO was invented by the Scam, it means 2 parts Hydrogen and 1 part Oxygen (H2O - water)
This is from consumeraffairs.com
Scientists debunk 'SCAM" gas-from-water claims.
Water4gas
Texas Sues Water4gas.com
Read the whole story at http://www.consumeraffairs.com/news04/2008/07/water4gas.html