This is called the Inauguration , part of which is the "swearing in" of the President at which point he repeats the oath of office as required by the Constitution.
INAUGURATION
Inauguration
The act or ceremony of installing a president into office is known as the presidential inauguration. This event typically includes a formal swearing-in ceremony where the president-elect takes the oath of office, often administered by the Chief Justice of the United States. The inauguration also features speeches, parades, and various celebrations, marking the official transition of power and the commencement of the new president's term.
Inaguration
Inauguaration
The ceremony is called the inauguration.
The ceremony in which the President of the United States takes the oath of office is called an inauguration or the Presidential Inauguration.
Presidential InaugurationInaugurationInauguration.
The Vice president is the president or as you called it,the presiding officer of the Senate.His office is at the capital buliding.
The process of being sworn into office is Inauguration."The President was Inaugurated for a second term"For an example of what happens in an Inauguration ceremony, here's a YouTube link to President Obama's Inauguration.
inauguration
inauguration