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Returns the 'display name' (title?) of the current channel. All channels, even the default channel, have a display name. If you haven't entered a display name, then it is the same as the channel name.
The display name can contain any text or html. It is not used in URL's or anywhere else that might be sensitive to 'funny' characters. So if your channel is named "itemsaboutmyfavoritebladeofgrass", you can use something more readable, like "Kentucky Blue," for the display name.
Set the display name in the channels editor.