Maybe I'm greedy or lucky or however you look at it. I have 6 collars and each has a sort of a different meaning or use if you will.
The first one my wife bought for me is my bondage collar. This is the one I wear most all of the time(when at home). It is one and a half inches wide and has a large ring in the front and three smaller rings, one on each side and one in the back. It is lined and very comfortable to wear. I guess maybe you get used to things and it becomes second nature to wear.
The second collar she bought is my posture collar. This one is 4 inches wide and is extremly strick. It has one large o ring in the front and is lockable so only she can remove it. It makes it impossible to look down, or even to the side without moving your entire body. I love wearing it but then again I love being bound by her so I guess it's more of a bondage tool than a normal collar. Again, this one is only used at home and most always it is used in some kind of bondage scene.
The third and forth collars I have are worn 24/7. I never remove either of them for any reason other than getting through airports. One being her dog tag. It has her name and id number on it. I wear this one with special pride. The other is a silver chain. This one was very expensive and I truely adore it. This is the one she refers to as my "day collar", although I never remove it.
The fifth collar she bought for me is the one I call my "day collar". It is a simple black leather collar about a half inch wide. No rings, just a collar. Anyone in the know would understand what it is but vanilla people just think it's a choker. This one I wear when we are out and about. I have had people ask me whats that around your neck and I just say "my collar" and that normally ends the conversation.
The last collar she bought for me is kinda cool. It is like 3/4's of an inch wide and wraps around my neck twice. It has one small ring in the front and is lockable. I normally wear this one when I'm outside doing yard work or whatever. It is also nice to wear in the summer time when it's hot out. It's not as big as the bondage collar or as restrictive. I guess we call this one a slave collar because it allows me to preform tasks for her safely and without restriction.
So I guess each collar has a different meaning while all the time each has the same meaning.