Barred lambda

The barred lambda ƛ, (in Unicode U+019B ƛ LATIN SMALL LETTER LAMBDA WITH STROKE (HTML ƛ)), also called running man,[1] is a modified letter of the Greek alphabet used in Americanist phonetic notation to transcribe [t͡ɬ]. It was introduced in American Anthropologist in 1934:

λ for [dl] has been used in Eskimo by Jenness ... ƛ for [tł] is an innovation formed from λ as ł from l.[2]

It is also commonly used to represent this phoneme in several languages of the Caucasus. A barred lambda is used in transcribing Sahaptin, e.g., iƛúpna ‘he jumped’. It occurs there less frequently than its ejective counterpart, e.g., iƛ’úna ‘he guessed right (in the bone game)’.

In physics, it is used to represent the angular wavelength, i.e. the wavelength (λ) divided by 2π, which corresponds to the length taken up by one radian of the wave.

References

(strictly speaking, this refers to the glottalized version, [t͡ɬʼ])
Herzog, George; Newman, Stanley S.; Sapir, Edward; Swadesh, Mary Haas; Swadesh, Morris; Voegelin, Charles F. (Oct–Dec 1934). "Some orthographic recommendations". American Anthropologist. 36 (4): 629–631. doi:10.1525/aa.1934.36.4.02a00300.

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[1] (strictly speaking, this refers to the glottalized version, [t͡ɬʼ])

[2] Herzog, George; Newman, Stanley S.; Sapir, Edward; Swadesh, Mary Haas; Swadesh, Morris; Voegelin, Charles F. (Oct–Dec 1934). "Some orthographic recommendations". American Anthropologist. 36 (4): 629–631. doi:10.1525/aa.1934.36.4.02a00300.