Not Match

(sometimes Natch) is the negation of Match. Thus, it returns 0 when its arguments match, and 1 when they do not. Like Match, it is a dyadic primitive function.

Some rendering engines (like Blink, the rendering engine of Chromium based browsers like Chrome, Edge, and Opera) tend to render  as   if the selected font  does not have the   character (U+2262), but does have   (U+2261) and   (U+0338). This issue can be avoided by selecting a font which is more appropriate for APL.