Number next to computer name?

Hi all,
I'm very curious to know why there is a number next to the name of my Macbook Pro. For example if you go to Finder and see under Devices it says "User's Macbook Pro (4)" The number in brackets seem to change every now and then and goes up in number. Pretty soon it will say "User's Macbook Pro (5)".
Does anyone have an idea of what this means?
Thanks in advance!

A few ideas for those with this issue:
If you have not yet tried a new/different admin account, I would create/login to a different one and see if the issue exists there. If not, this would suggest a particular setting in your normal account and/or a corrupt preference file.
First, I would make a clone/backup (SuperDuper, CarbonCopyCloner, TimeMachine) so you can return to your current state, if, after messing with settings, things get messed up beyond your being able to restore them. (That's what's nice about full clones/backups, you can play pretty much to your heart's content, and if things don't work out, "press the go-back-in-time-button" in almost all cases except for firmware changes.)
Open System Preferences:
Network: Advanced: uncheck "Remember networks this computer has joined." Click ok. Restart. (And/or play with other settings you're comfortable restoring afterwards.)
Accounts: Login Options: Network Account Server: Join (I know nothing about this setting, just seems like it could be related and may be something you want to look into further). Restart.
Sharing settings. Restart.
Print & Fax: Uncheck "Share this printer on the network." Restart.
Before you make your next clone/backup, make sure everything functions as you need it to, as you don't want to copy any mistakes over the original functioning clone/backup, even if it is adding those numbers after the computer name.

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