When you hear someone say the word “complications,” it’s usually not a good thing. But in watch parlance, a complication is the interesting aspect (or aspects) of a timepiece that makes it more useful and infinitely more valuable. By definition, a complication is anything more than the standard three-hand time display in hours, minutes and seconds. So, for example, at its simplest, a date display or a small second sub-dial is considered a complication. Any complication makes a watch more difficult to manufacture because the additional functions draw stored power from the movement and must work flawlessly while the watch continues to do its main job, telling time precisely. Here’s a quick and easy guide to today’s top complications.