ʻO ke kila ʻāpana H he ʻano o ka ʻāpana hoʻokele waiwai kiʻekiʻe-efficiency profile me ka ʻoi aku ka maikaʻi o ka māhele ʻāpana ʻāpana a me ka lākiō kaumaha o ka ikaika kūpono.Ua kapa ʻia ʻo ia no ka mea ua like kona ʻāpana me ka leka Pelekane "H".No ka mea ua hoʻonohonoho ʻia nā ʻāpana a pau o ke kila H-section i nā kihi ʻākau, ʻo ka H-section steel ka mea maikaʻi o ke kūpaʻa kūlou ikaika, ka hana maʻalahi, ka mālama ʻana i ke kumu kūʻai a me ke kaumaha o ke kūkulu ʻana ma nā ʻaoʻao āpau, a ua hoʻohana nui ʻia.