The BitOr command returns the bitwise or of the specified integers.

$\mathrm{with}\left(\mathrm{MmaTranslator}\left[\mathrm{Mma}\right]\right)\:$

$\mathrm{BitOr}\left(8\,12\right)$

$12$

$\mathrm{with}\left(\mathrm{MmaTranslator}\right)\:$

$\mathrm{FromMma}\left(\mathrm{`BitOr[8,\; 12]`}\,\mathrm{evaluate}\right)$

$12$