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enter image description here

Can I add another one? Because the plus sign just opens up the list.

Jamie
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    that icon in the "outliner" represents a mesh object in your scene... add another mesh, you get another icon... curve objects have a different icon, and lamps, cameras, too... – m.ardito Sep 07 '17 at 22:06
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    Why do you need another one? What did you expect when pressing the plus sign which is acting as opening heirarchy? – Mr Zak Sep 07 '17 at 23:04

1 Answers1

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That triangle indicates that your object is a Mesh Object.

Each time you add a new mesh object in Object Mode, it will be listed in the outliner:

enter image description here

Objects that are not meshes will appear with different icons:

enter image description here

If an object is parented to another, then the parent-children hierarchy will be reflected on the outliner:

enter image description here

If you switch to Edit Mode and add a new mesh, that mesh will be part of the active object, and it will not be added as a new object in the outliner:

enter image description here

To read more about the outliner visit: https://docs.blender.org/manual/en/dev/editors/outliner.html?highlight=outliner

  • Also related: https://blender.stackexchange.com/questions/56153/why-cant-objects-in-edit-mode-have-their-own-name/56155#56155 –  Sep 08 '17 at 14:24