Pa++ern is an esoteric language developped by the Japanese duo Daito Manabe and Motoi Ishibashi. The main idea is that one can create custom embroidered t-shirts using Twitter as the control interface.
The program uses sets of one character commands that instruct a sewing machine to excecute specific designs. Users can input these command codes via the Twitter micro-blogging service (@_pt), and view their results on the Pa++ern website.

Source: PSFK, Pa++ern