[GreenKeys] Slashed zero on Teletypes

[Dave Horsfall]

As a (former) computer programmer, I still write Zero with a diagonal 
stroke, Seven and Zulu with a horizontal stroke, and One with a serif and 
a base-bar.

Consistency has never been the hobgoblin of this little mind...

-- 
Dave Horsfall DTM (VK2KFU)   "Those who don't understand security will suffer."
http://www.horsfall.org/spam.html (and check the home page whilst you're there)