The black knobs on our black-front Kenmore stove have slightly raised pointer extensions. At a glance, you cannot tell whether the knob points upward to OFF or downward to 5.
Oddly, the oven temperature knob has a nice white index line engraved (well, molded) in the pointer extension. So it’s not like they didn’t know how to do index lines. I’m guessing they had to take a buck out of the build cost and omitting four index lines added up to just the right amount.
I added tape markers shortly after we got the thing. The previous tape was fluorescent orange; the adhesive lasts several years before turning gummy. These new markers are snippets of outdoor-rated retroreflective tape and should last longer.
Run the knobs through the dishwasher occasionally to get ’em nice & shiny. Surprisingly, that doesn’t seem to bother the tape.
The Smell of Molten Projects in the Morning 
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[…] Those reflective tape snippets on unmarked stove knobs have survived many trips through the dishwasher; that idea is a keeper. […]