@interface NSUnitFrequency : NSDimension <NSSecureCoding> @property (class, readonly, copy) NSUnitFrequency *terahertz; @property (class, readonly, copy) NSUnitFrequency *gigahertz; @property (class, readonly, copy) NSUnitFrequency *megahertz; @property (class, readonly, copy) NSUnitFrequency *kilohertz; @property (class, readonly, copy) NSUnitFrequency *hertz; @property (class, readonly, copy) NSUnitFrequency *millihertz; @property (class, readonly, copy) NSUnitFrequency *microhertz; @property (class, readonly, copy) NSUnitFrequency *nanohertz; @property (class, readonly, copy) NSUnitFrequency *framesPerSecond; @property (class, readonly) BOOL supportsSecureCoding; + (void)initialize; + (id)icuType; + (id)baseUnit; + (id)_measurementWithNaturalScale:(id)a0 system:(unsigned long long)a1; @end