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$$\large{\displaylines{\begin{array}{c|c|c|c} & {\color{#ff7800}\Box} & {\color{#ff7800}\circ} & {\color{#ff7800}\bigtriangleup} \\ \hline 1 & 1{\color{#ff7800}\Box} & 1{\color{#ff7800}\circ} & 1{\color{#ff7800}\bigtriangleup} \\ \hline 2 & 2{\color{#ff7800}\Box} & 2{\color{#ff7800}\circ} & 2{\color{#ff7800}\bigtriangleup} \\ \hline 3 & 3{\color{#ff7800}\Box} & 3{\color{#ff7800}\circ} & 3{\color{#ff7800}\bigtriangleup} \end{array}}}$$

. . . операции над множествами декартово произведение множеств