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 believe that the symbol is derived from a hastily written 'g' which would stand for good (goed) or seen (gezien). The symbol is rarely used outside of the Netherlands apart from (former) Dutch colonies like Indonesia, South Africa, the Netherlands Antilles and Suriname.
- "Waar komt het vandaan?". NRC (in Dutch). Retrieved 2018-05-23.
- "How to make a "krul" (unofficial Dutch symbol for OK)". Stackexchange. Retrieved 2018-05-30.
- "What is the name or Unicode for this symbol (similar to ₰, Dutch, called Krul)". Stackexchange. Retrieved 2018-05-30.