W is for waterwitch, a hand held device used for homing in on target cell phones in the field in order to precisely locate a target, probably in order to kill or capture the target.
'Water witching' is a term for the ancient practice of dowsing, a type of divination in which a hand held Y-shaped twig or rod, called a dowsing rod or a witching rod, is used to locate ground water or other valuables. According to Wikipedia, dowsing was also used to track criminals and heretics in 17th century France.
It's also worth noting that assassination or murder is sometimes referred to by the euphemism 'wetwork,' in an allusion to spilled blood.
2 applications of color, with blind emboss
Kochi Kozo paper