Nephrite as a surface treatment. A lot of nephrite tools and amulets are known since the Early Neolithic (VII mill. BC) to the Late Chalcolithic (V mill. BC) on the Balkans (mainly Bulgaria; also in Greece, Serbia, Croatia) from two or more unknown sources - Balkan "nephrite culture". Such tools are found in the Later Neolithic of Poland (from the most probable local source Jordanów), Sardinia (Italy) (unknown source) and Switzerland (Kostov, 2005; 2013). Single or just a few finds of nephrite artifacts are reported also from some other European countries. During Neolithic times, the key known sources of nephrite jade
The First Series of Standardized Forms of Words with Non-standardized Variant Forms The First Series of Standardized Forms of Words with Non-standardized Variant Forms The First Series of Standardized Forms of Words with Non-standardized Variant Forms () published on December 19, 2001 and officially implemented on March 31, 2002, is a list of 338 Standard Chinese words that have variant written forms (i.e. where the same word may be written with one or more different Chinese characters with the same pronunciation, referred to as "", translated into English in the official publication as "variant forms of the same word"). In the "First Series", one of the variant written forms for each word