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When Charlie Kirk was killed, President Trump ordered flags lowered to half-staff for four days.

The custom dates back to the 1600s, when a British ship honored its captain’s death by flying its flag half-mast to make room for an invisible flag of death on top.

Now flags are lowered on national days of remembrance, like Pearl Harbor, as well as to pay tribute to fallen officials or recognize public mourning.

So far this year, Ohio Gov. Mike DeWine has ordered flags on state property lowered 18 times for a total of 105 days, or about 40% of this year. The bottom right of the Ohio governor’s official state website is set aside to explain Ohio’s current flag status.

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