Two-tone
Two-tone, two tone, or 2 tone, etc., may refer to:

Audio and sound
Two-tone analysis, in nonlinear system measurement
Two-tone attention signal
Two-tone chime, such as the "ding dong" sound of a doorbell
Two-tone sequential paging, selective calling method in analog 2-way radio transmission
Two-tone siren, a European type of siren

Language
Two-tone language
Diphthong (Greek for two tones), in linguistics, a gliding vowel

Music
2 Tone (music genre), music genre
2 Tone Records, record label
Two Tone Club, French ska band
"Two-Tone" Tommy, bass musician

Other
Two-tone color, such as RG color space
Two-tone paint
Two-tone pattern
Two-toned lobsterette
Two-Tone, dalmatian dog in the 2003 animated film 101 Dalmatians II: Patch's London Adventure and 1996 remake
Twotone, also known as Ryan Gobbe and Mieli, an Australian electronic musician
Two-tone testing, a test in radio systems for intermodulation distortion

See also
Tone (disambiguation)
Tommy Tutone