The phenomenon exists in multiple countries, and can become a social or political issue, for example in the 2016 Indian banknote demonetisation. In some societies, this surreptitious custom is attached to a particular term, idiom, or other cultural expression: In Japan, it is referred to as "hesokuri" ("navel hoarding"), or in the past it was "haribako-gin" ("sewing box silver"); in Germany, it is referred to as "schwarze Kasse" ("black coffer"); and in Eastern European Jewish communities, it is called the "knipl" ("knot", as in a knotted kerchief).