How they display the carrier name on the Notification bar

Online ordered the 16 GB US version, on the ATT network.

There is no branding in notification bar...it is lower-center on the lock screen and when you drag down the notification bar.
 
Rooting, unlocking the boot loader and installing Xposed Framework and Gravity box.

From a Sprint Moto X using AC Forums app
 
It is a feature that comes with some ROMs, like Motorola and Miui amongst others...
But if you want the logo (instead of the name) of your carrier to be shown in the status bar just install the free app "Roaming Info" from Google Play (can't insert links, just search for it).
 

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