I would like to know what is the name of the electronic scoring/indicator device used in major conferences like the UN Summit, DAVOS, ASEAN Summit, ECOWAS Summit etc?
It was posted simultaneously in four places, unfortunately. Perhaps they should all be combined in chat.
As for the question, such automatic response systems are quite common and of many types. If you search on "voting" instead of scoring, you may get more useful hits, such as this one: http://www.replysystems.com/?gclid=CNfQ4JC4iKECFREEiQodjSChRA
As for what is actually used by a particular organization, I think you need to contact that organization directly. Many colleges use them today, so that might be an easier place to ask than , say, the UN. However, if you are in the USA, you could make an FOIA request and find out exactly what is used in the American Congress. An FOIA request can take several years to get a response.