Delft is the style of art used on Delftware or Delft pottery. It is a type of tin-glazed earthenware in which a white glaze is applied to the item before it is decorated with various metal oxides, most especially the cobalt oxide which provides the blue which is delft's best known feature. In the 17th and 18th centuries, Delftware was primarily produced in Delft, the Netherlands and exported across Europe. Although still well regarded, production has fallen off since the 18th century, with Delftware made post-1740 considered inferior to the older material. Nowadays, only two places are left that still produce Delftware.

As an art, Delft is primarily blue on white, often with plant-based ornamentation popularized by Chinese porcelain.

One of British Airways' ethnic tailfin liveries, Delftblue Daybreak was inspired by Delft.

More information:

https://en.wikipedia.org/wiki/Delftware