A number allocated to a syllable in various transliteration systems such as Hanyu Pinyin indicating the tone in which it is pronounced.

Having two colours or shades. / Giving two different sounds, either alternately or simultaneously.

(slang) The intercept sound and frequencies a PBX system generates due to dialing error or denial of the service as requested.

Alternative form of halftone

Alternative form of halftone

(music) A superposition of sine waves, separated by an octave, whose relative amplitude may be varied to give the illusion of a rising or falling note.

Relating to a type of telephone with buttons, each of which produces a tone which corresponds to the relevant digit.

a light, balanced arm that holds the pickup cartridge on a record player

(music) A piece of symphonic music which, like a poem, has a narrative or descriptive theme.

A telephone with buttons that produce tones, one for each digit. / A tone produced by such a telephone.