udunits/src/main/java/ucar/units/UnitImpl.java
public String makeLabel(final String quantityID) {
        final StringBuilder buf = new StringBuilder(quantityID);
        if (quantityID.contains(" ")) {
            buf.insert(0, '(').append(')');
        }
        buf.append('/');
        final int start = buf.length();
        buf.append(toString());
        if (buf.substring(start).indexOf(' ') != -1) {
            buf.insert(start, '(').append(')');
        }
        return buf.toString();
    }
public String makeLabel(final String quantityID) {
        final StringBuilder buf = new StringBuilder(quantityID);
        if (quantityID.contains(" ")) {
            buf.insert(0, '(').append(')');
        }
        buf.append('/');
        final int start = buf.length();
        buf.append(toString());
        if (buf.substring(start).indexOf(' ') != -1) {
            buf.insert(start, '(').append(')');
        }
        return buf.toString();
    }
Returns a label for a quantity in this unit.

@param quantityID
The identifier for the quantity (e.g. "altitude").
@return The appropriate label (e.g. "altitude/m").