org.checkerframework.checker.units.qual

Annotation Type mm

@Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE_USE,TYPE_PARAMETER})
 @SubtypeOf(value=Length.class)
 @UnitsMultiple(quantity=m.class,
               prefix=milli)
public @interface mm

Millimeter.

See the Checker Framework Manual:

Units Checker