Flags across the U.S. are being flown at half staff in honor of Pope Francis. Pope Francis died Monday at the age of 88 after months of failing health.

A proclamation from President Donald Trump said the move was a “mark of respect” for the late Pope.

The statement noted:

“I hereby order that the flag of the United States shall be flown at half-staff at the White House and upon all public buildings and grounds, at all military posts and naval stations, and on all naval vessels of the Federal Government in the District of Columbia and throughout the United States and its Territories and possessions until sunset, on the day of interment. I also direct that the flag shall be flown at half-staff for the same length of time at all United States embassies, legations, consular offices, and other facilities abroad, including all military facilities and naval vessels and stations.”

Flags will remain at half-staff until sunset on the day of burial for Pope Francis.

Pope Francis will be laid to rest Saturday after lying in state for three days in St. Peter’s Basilica. His replacement will be selected at a Conclave of cardinals set to meet between May 5 and 10th.

Funeral services are planned for Saturday at 10 a.m. in St. Peter’s Square. Trump and first lady Melania Trump are expected to attend.

Half staff or half mast?

There is a difference between referring to a flag at half-staff vs. half-mast.

If a flag flies from a pole in the ground or attached to a building, it is referred to as half-staff when it is lowered. If it flies from a ship, it is called half-mast when it is lowered.

According to the U.S. Flag Code, only the president can dictate a nationwide lowering of the flag, an honor generally reserved for heads of state, former presidents or other government officials. The U.S. flag has also been lowered as a tribute to leaders of other countries or after a significant natural disaster.

State governors can also order the flags to be lowered within their states.