3
Use an InterpretationBox, TagBox or TemplateBox with a SyntaxForm option. For example:
MakeBoxes[f[a, b, c, d], TraditionalForm] ^:= InterpretationBox[
RowBox[{RowBox[{"{","a","b","}"}], RowBox[{"{","c","d","}"}]}],
f[a,b,c,d],
SyntaxForm->"^"
]
Then:
2 f[a,b,c,d] //TraditionalForm
2 {a b}{c d}
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