What do the symbols that are at the left in the Debug Area from the XCode mean? i, A, L, E, etc...

I was looking for that information in the Apple docs (here and here, basicly), but could not find it.
What do the symbols that are at the left in the Debug Area from the XCode mean? i, A, L, E, etc...

I was looking for that information in the Apple docs (here and here, basicly), but could not find it.
Apple developers must have added it to the docs after this question was asked, as it is in the docs
There are actually only 6 labels, L, A, S, V, R, E, where V is shared between Global and instance variables. At least now, they are exactly the same colour.