Intsimbi yeCarbon I imiqadi, ekwabizwa ngokuba yimiqadi, yeyona nto ibalulekileyo kulwakhiwo nobunjineli. Igama elithi "I-beam" livela kwicandelo elinqamlezileyo lomqadi, elifana neleta "I." Olu luyilo lubonelela ngamandla okugqwesileyo kunye nozinzo, lwenza ukuba lube lukhetho olufanelekileyo lwezicelo ezahlukeneyo. Enye yezibonelelo eziphambili zentsimbi yekhabhoni yemiqadi ngum