If you read the 95 page Apple Watch User Guide cover to cover, move along, you obviously know this information. But if not, either flip over to page 7 and check out the chart at the bottom of the page, or follow the headline link.

Either way, good idea to learn the meaning of the seven possible status icons that appear above the 12 on your watch face. And not such a bad idea to bookmark the link to the User Guide for later reference.