ISM band:
The industrial, scientific and medical (ISM) radio bands are radio bands (portions of the radio spectrum) reserved internationally for the use of radio frequency (RF) energy for industrial, scientific and medical purposes other than telecommunications.
en.wikipedia.org
ISM频段:
ISM频段（Industrial Scientific Medical Band），中文意思分別是工业的(Industrial)、科学的(Scientific)和医学的(Medical)，因此顧名思義ISM频段就是各國挪出某一段頻段主要開放給工业，科学和医学機構使用。
zh.wikipedia.org
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ISM bandISM频段