The duck kill marks are clearly for "kills of moot".
In any case, my dear boy, kill boards are something for Church:
*ahem*
"And a-did those feeeeeeeeeeeeeeeeeeeeeeeeet
in anc-i-e-hent tiiiiiiiiiiiiiiiiiiiiiiiiiiii
iiiiiiiiiiiiiiiiiiiiiiiiiiiii
iiiiiiiiiiiiime
walk upon Engl-land's
moun-tains greeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeen?"
(With thanks to Martin Bull and his shots of St. Andrew's Church, Little Snoring.)