An array of 64-bit double precision floating point numbers.
FloatArray and its subclass Signal are commonly used to hold audio data in SuperCollider. Since almost all audio has 16-bit or 24-bit precision, using double precision floats for this purpose would be a waste of space. In other words, use FloatArray for audio, and DoubleArray for precise math operations.
The complete list of RawArray types in SuperCollider is: