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If you curl the fingers of your right hand / palm,  in the direction of movement of the object, then the thumb stretched will give the direction of the angular momentum.

the direction of L coming out of the page can be taken as positive and the direction going into the page or plane of paper is taken as negative.

A cross encircled indicated direction going into the plane of paper and perpendicular to it.  A dot placed in a circle indicated the direction coming out of the page/ paper.

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