Guard band
In telecommunications, a guard band is a narrow, intentionally unused
frequency band that is placed between adjacent frequency bands to minimize interference between them.[1] It is used in frequency-division multiplexing. Guard bands exist in both wired and wireless
communications.
A guard band can also be licensed for use by low-powered devices such as a private mobile phone network.[2]
References
Look up guard band in Wiktionary, the free dictionary.