I'd bet most "Metric users" don't even know Deci/Deka exist.
In my country, for some reason, people use deka when buying sliced meat at a supermarket deli counter or at the butcher. "I'll have 20 deka of that smoked ham over there please". Noone uses it in pretty much any other scenario, just this. I never understood why that is and I don't even know if any other nations do that.
Also shots (as in, alcohol) are often listed in centiliters on drinks menus, and again this is the only time anyone uses that unit.
In my country, for some reason, people use deka when buying sliced meat at a supermarket deli counter or at the butcher. "I'll have 20 deka of that smoked ham over there please". Noone uses it in pretty much any other scenario, just this. I never understood why that is and I don't even know if any other nations do that.
Also shots (as in, alcohol) are often listed in centiliters on drinks menus, and again this is the only time anyone uses that unit.