Mud Pulse : A pressure pulse in the mud system. Some downhole tools can be controlled by mud pulses and some data is transmitted from bottom hole to the surface via pressure pulses
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}