function signum() {
  return this.ind; // [note this assumes values for ind.]
  }
Returns the sign of this <code>BigDecimal</code>, as an
<code>int</code>.
This returns the <i>signum</i> function value that represents the
sign of this <code>BigDecimal</code>.
That is, -1 if the <code>BigDecimal</code> is negative, 0 if it is
numerically equal to zero, or 1 if it is positive.

@return An <code>int</code> which is -1 if the
        <code>BigDecimal</code> is negative, 0 if it is
        numerically equal to zero, or 1 if it is positive.
@stable ICU 2.0