Pork floss is also known as pork sung, meat floss, and shredded dried pork. You can find many kinds in Asian grocery stores with different names like 肉酥，肉铺，or 肉绒. They are all under the umbrella term rou song 肉松. The different kinds of pork floss are all very similar in terms of taste and made with dried shredded pork and sweet and savory seasoning. One might be slightly more shredded, sweeter, saltier, and/or drier.