@interface NSUnitAcceleration : NSDimension <NSSecureCoding> @property (class, readonly, copy) NSUnitAcceleration *metersPerSecondSquared; @property (class, readonly, copy) NSUnitAcceleration *gravity; @property (class, readonly) BOOL supportsSecureCoding; + (void)initialize; + (id)icuType; + (id)baseUnit; @end