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In Illustrator and Balsamiq (i know, they are not scientific tools) the clone action is Ctrl+D (on Win, on Mac it's Cmd+D). While in Illustrator it's actually "repeat transformation". But you can use it for sort of "cloning". D can stand for "duplicate". So probably instead of labeling the action "clone", you could label it "duplicate" and put Ctrl+D as ...


If the question is taken at face value, i.e. strictly a choice between the →/↓ arrows or the +/- signs, then I suggest using arrows. Arrows denote the direction and a sense of movement to another place or view. +/- signs could be construed as meaning add / remove. For example it looks like I can add a manufacturer, or add an Extra item. While, the minus ...

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