☙

gamma (γ)

1

A unit of magnetic flux density, used about from 1896 to present, = 1 nanotesla. Symbol, γ. It was mainly employed in studies of terrestrial magnetism, where it represented the limit of precision of measurements.

According to the current national standard in the United States¹, the gamma is not to be used. The tesla should be used instead.

M. Eschenhagen.
Terrestrial Magnetism and Atmospheric Electricity, volume 1, page 57, footnote 2.

1. IEEE/ASTM SI 10™-2002.
American National Standard for Use of the International System of Units (SI): The Modern Metric System.
New York: IEEE, 30 December 2002.

See Section 3.3.3.

2

A unit of mass, = 10⁻⁹ kilogram = 1 microgram.

According to the current national standard in the United States¹, the gamma is not to be used. The microgram should be used instead.

BIPM Proc.-Verb. Com. Int. Poids et Mesures, 1880, page 56.

1. IEEE/ASTM SI 10™-2002.
American National Standard for Use of the International System of Units (SI): The Modern Metric System.
New York: IEEE, 30 December 2002.

See Section 3.3.3.