The International telecommunications Union, ITU frequency bands define a set of portions of the radio frequency spectrum: VLF, LF, HF, VHF, UHF, EHF, etc .
Internet of Things for Architects
Radio-frequency Spectrum Allocation Table/Chart - National Information & Communications Technology Authority
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ISM Bands Around the World, Blog
Radio spectrum: nine frequency bands
Complying with ITU regulations for spectrum management
PPT - Frequency Bands PowerPoint Presentation, free download - ID:8825063
Confused about RF-band letter designations? That's not surprising!
ITU Radiocommunication Sector (ITU-R) - everything RF