If it’s achievement points then how come whenever I go to armory the total number is much higher for any character?
Don’t even start with achievement points. 
Since the introduction of account-wide achievements, which was badly botched, Blizzard has adopted the system of Bistromathics to calculate achievement points.
The forum and armoury character info is pretty unreliable about most things, but even in game, I see one number on my Alliance mage and a different one on my Horde mage. The armoury used to honour requests to show only character-specific achievement numbers, but it now shows a bizarre mixture of character-specific and account-wide achievements, affected by level. Oh, and in your guild roster you will probably see a different number again. I did once try to reconcile some of these numbers, and I think I got to the root of some of the differences, but could think of no reason why those specific achievements should be counted on one character but not on the other.
The late great Douglas Adams explains the advanced math of Bistromathics:
Bistromathics is the most powerful computational force known to parascience. A major step up from the Infinite Improbability Drive, Bistromathics is a way of understanding the behavior of numbers. Just as Einstein observed that time was not an absolute, but depended on the observer’s movement through space, so it was realized that numbers are not absolute, but depend on the observer’s movement in restaurants.
Nonabsoluteness
The first nonabsolute number is the number of people for whom the table is reserved. This will vary during the course of the first three telephone calls to the restaurant, and then bear no apparent relation to the number of people who actually turn up, or to the number of people who subsequently join them after the show/match/party/gig, or to the number of people who leave when they see who else has turned up.
The second nonabsolute number is the given time of arrival, which is now known to be one of those most bizarre of mathematical concepts, a recipriversexclusion, a number whose existence can only be defined as being anything other than itself. In other words, the given time of arrival is the one moment of time at which it is impossible that any member of the party will arrive. Recipriversexclusions now play a vital part in many branches of maths, including statistics and accountancy and also form the basic equations used to engineer the Somebody Else’s Problem field.
The third and most mysterious piece of nonabsoluteness of all lies in the relationship between the number of items on the bill, the cost of each item, the number of people at the table and what they are each prepared to pay for. (The number of people who have actually brought any money is only a subphenomenon in this field.)
Numbers written on restaurant checks within the confines of restaurants do not follow the same mathematical laws as numbers written on any other pieces of paper in any other parts of the universe.
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