ModulationType is an option of FrequencyModulation, specifying the type of modulation.
Overtones is an option to Waveform that specifies the number of overtones to be present in a standard waveform when created with Fourier summation.
Parallel is a setting of ModulationType, an option of function FrequencyModulation.
RingModulation is an option to AmplitudeModulation which specifies whether to use ring modulation.
Sawtooth is a type of waveform.
Square is a type of waveform.
Triangle is a type of waveform.
$BenchmarkSystems gives the names of systems for which the MathematicaMark8 benchmark data is known.
EasterSundayGreekOrthodox[year] gives the date of Easter Sunday according to the Greek Orthodox Church using the Gregorian system.