Flourish of approval
A flourish of approval or krul is a mostly Dutch symbol used for grading schoolwork or to show that one has seen and agreed with a paragraph. The krul first appeared in the early 19th century together with the rising bureaucracy in the Netherlands. Historians think that the symbol is derived from a hastily written 'g' which would stand for good or seen. The symbol is rarely used outside of the Netherlands apart from Dutch colonies like Indonesia, South Africa, the Netherlands Antilles and Suriname.
Despite its wide usage throughout the country and its former colonies, as of May 2018 there is no Unicode symbol for it.