@tennisdoc56 No, it just indicates that they're using a (now obsolete) R2R chip. Phillips (e.g.,
TDA1541) and Analog Devices (e.g., AD1865n-k) are two of the common ones used in the best gear. Other manufacturers, such as Aqua Hifi, Holo Audio, TotalDAC, and MSB build their own R2R resistor ladders, but I personally do not believe that this approach guarantees better performance over a chip-based solution.