Re: from my vast research resources ...
The short answer is that there is no consensus on what 666 means.
The long answer is that there are many proposed answers, but apparently there aren't enough people "with understanding" to agree as to the answer
Back in the day when I was a fundie xian I held to a fairly literalist, innerant view of the bible and the rule of interpretation I held to was that only the bible should be used to interpret the bible. That is to say if there were prophetic portions that were unclear in meaning then one should look elsewhere in the bible to find those prophetic symbols and their meaning.
Much of the symbolic language in Revelation was used in the OT prophecies and the meaning of those symbols is known.
In the case of 666, it is only used one other time in the bible. Unfortunately the biblegateway site isn't working correctly right now (it always defaults to an "any word" search) so I can't find the verse that uses six hundred and sixty six, but it refers to money.
The point being that using this system of interpretation the number 666 should be found to indicate money.
In the context of the verses this fits as this mark is required to buy or sell. This could then indicate that the beast is an entity that would require some sort of loyalty if one wished to be able to engage in commerce. Since the bible elsewhere says that the love of money is the root of all evil this interpretation works even better. The antichrist then will force humans to choose between their love for god and their love for money.
Of course that is just one way to look at it. 6 is also a number the bible uses to express imperfection. 7 is the perfect number and can be used to represent God. 6 then is a human number. Man was created in the image of God, but isn't God so 6 is man's number. Some have held that the New Agers are the antichrist since they hold that man is god. In other words the antichrist is one who asserts than man is god. This goes back to the Adam and Eve story where man, tempted by the serpent, chased after godhood by aquiring the knowledge of good and evil, just as God had such knowledge. The story of the tower of babel would be another example of man chasing after godhood with unfortunate results. The antichrist then is one who teaches that we are gods.
Of course there are still more semi plausible ways to look at it. Using numerology to derive Nero can work (then again numerology can work for anything).
Some schools of though hold that there is no single antichrist. Rather the antichrist is a type of person (or spirit), not an individual person. If you scan the new testament you will find the word antichrist used (this goes back to the idea that only the bible should be used to interpret the bible). 1 John 4:3 says "but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world. " So at least the spirit of the antichrist has been present for a long time. We have heard it is coming, but we are also told it is already here.
In the end there are many theories as to what it means, but nobody knows for sure. At least not anyone I know
If you wish you can ascribe any meaning you wish to it. Lots of others have done that. Some explanations fit better than others, but there are many that seem to work about as well as the next one.