Voiceless alveolar lateral affricate in the context of Nahuatl varieties

The Nahuan or Aztecan languages are those languages of the Uto-Aztecan language family that have undergone a sound change, known as Whorf's law, that changed an original *t to /tɬ/ before *a. Subsequently, some Nahuan languages have changed this /tɬ/ to /l/ or back to /t/, but it can still be seen that the language went through a /tɬ/ stage. The most spoken Nahuatl variant is Huasteca Nahuatl. As a whole, Nahuatl is spoken by about 1.7 million Nahua peoples.

Some authorities, such as the Mexican government, Ethnologue, and Glottolog, consider the varieties of modern Nahuatl to be distinct languages, because they are often mutually unintelligible, their grammars differ and their speakers have distinct ethnic identities. As of 2008, the Mexican government recognizes thirty varieties that are spoken in Mexico as languages (see the list below).

A voiceless alveolar affricate is a type of affricate consonant pronounced with the tip or blade of the tongue against the alveolar ridge (gum line) just behind the teeth. There are several types with significant perceptual differences:

• The voiceless alveolar sibilant affricate [t͡s] is the most common type, similar to the ts in English cats.
• The voiceless alveolar non-sibilant affricate [t͡θ̠] or [t͡θ͇], using the alveolar diacritic from the Extended IPA, is somewhat similar to the th in some pronunciations of English eighth. It is found as a regional realization of the sequence /tr/ in some Sicilian dialects of Standard Italian.
• The voiceless alveolar lateral affricate [t͡ɬ] is found in certain languages, such as Cherokee, Mexican Spanish, and Nahuatl.
• The voiceless alveolar retracted sibilant affricate [t͡s̺], also called apico-alveolar or grave, has a weak hushing sound reminiscent of retroflex affricates. One language in which it is found is Basque, where it contrasts with a more conventional non-retracted laminal alveolar affricate.

The barred lambda (Ƛ ƛ) (U+A7DC Ƛ LATIN CAPITAL LETTER LAMBDA WITH STROKE, U+019B ƛ LATIN SMALL LETTER LAMBDA WITH STROKE), is a modified letter of the Greek alphabet, commonly encountered in North American linguistics. It is used by the Salishan and Wakashan languages in Canada. It is also used in Americanist phonetic notation, where it is also known as running man, to transcribe [t͡ɬ]. In physics, it is used to represent the angular wavelength, i.e. the wavelength (λ) divided by 2π (τ), which corresponds to the length taken up by one radian of the wave.

It was first used in a phonetics context in American Anthropologist in 1934: