There are several different ways of renaming an object:
Locate the object in the Outliner. Right click its name and select the Rename option. Alternatively, you can double click the name. Type in the new name and press Enter to confirm.
In the 3D View Properties Region, you can rename the object in the Item panel. Left click the text field, type in the name, and press Enter to confirm.
In the Properties Editor, go to the Object tab (the one with a yellow cube) and, at the top left, click in the text field to type in the new name. Press Enter to confirm.
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