Ma'anar ƙamus na "drumhead" na iya samun fassarori daban-daban dangane da mahallin, amma gaba ɗaya yana nufin: and buga don samar da sauti. Kotu ta wucin gadi ko kotu da aka taru don gudanar da shari'a ko horo, galibi ana amfani da su a cikin yanayin soja ko gaggawa. Wannan amfani ya zo ne daga al'adar yin amfani da ganga a matsayin fili don riƙe gaggawar kotun soja a cikin soja. adalci" ko" shari'ar ganduje "don kwatanta gaggawar shari'a ko rashin adalci.