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You might define your own function cross, that calls Cross when the number of arguments is larger than 1:

cross=If[Length[{##}]>1, Cross[##], Identity[##]]&;#]&;

You might define your own function cross, that calls Cross when the number of arguments is larger than 1:

cross=If[Length[{##}]>1, Cross[##], Identity[##]]&;

You might define your own function cross, that calls Cross when the number of arguments is larger than 1:

cross=If[Length[{##}]>1, Cross[##], #]&;
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You might define your own function cross, that calls Cross when the number of arguments is larger than 1:

cross=If[Length[{##}]>1, Cross[##], Identity[##]]&;