Recommendation B.151) 
NOMENCLATURE OF THE FREQUENCY AND WAVELENGTH BANDS
USED IN TELECOMMUNICATIONS
	The CCITT,
considering
	(a)	that the merits of Heinrich Hertz (1857–1897), as a research worker on the basic phenomena of radio waves, are universally recognized, as was confirmed at the centenary of his birth; and that as early as 1937 the IEC adopted the hertz (symbol: Hz) as a name for the unit of frequency (see inter alia, Publication 27);
	(b)	that the nomenclature in this Recommendation should be as synoptic as possible and that the designation of frequency bands should be as concise as possible,
recommends
	(1)	that the hertz (Hz) be accepted for use in publications of the ITU, as the name for the unit of frequency in accordance with Recommendation B.3 on the use of the international system of units (SI);
	(2)	that Administrations should always use the nomenclature of the frequency and wavelength bands given in Annex A:
–	Table A–1/B.15 and Notes 1 and 2, which take account of No. 208 of the Radio Regulations, and
–	Note 3, which contains the proposal of the International Union of Radio Sciences (URSI),
except in those cases where this would inevitably cause very serious difficulties.
ANNEX A
(to Recommendation B.15)
Note: Tables A-1/B.15 to A-3/B.15 are missing