Horological Meandering

I have thought to do this quite a long time. Today I started to do. What are the Waffle, Ribs and Chequer for? ...  

1/ Waffle iron / manhole 2/ Radiator grill / radiator or air-conditioner grating 3/ Nonskid plate A little bonus ;-) Best wishes Alkiro ...  

I can have my stroopwaffel and a waffel design on my wrist to remind me of the stroopwaffel I just ate! Interesting comparison and way to look at these watches.