Here in the U.S., water faucets are called "hot" and "cold", even though the one called "cold" is really just "unheated", i.e., room temperature. By convention, hot is always on the left (when there are two faucets) or to the left (with a one-handle faucet). If they have color labels, hot is red and cold is blue. If they have letter labels, hot is H and cold is C. Travelers might get momentarily confused if they encounter "C" for calor (hot) and "F" for frío (cold). Do these other conventions differ much in countries around the world?