The Galero.
it means that they are running for Pope......i think, that was it. The Cardinals of the Catholic Church wear red because it is a symbol that they are ready to shed their blood (hence the color red) to defend their faith.
The box-like caps are called biretta ( singular birettum) Bishops wear purple ones. Cardinals wear red. There is a red brimmed hat the cardinals may wear called a galero. The skullcap worn by bishops, cardinals and the pope is called a zucchetto.
The pope's fisherman's hat is called a "zucchetto." It is a skullcap worn by the Pope and other high-ranking clergy members in the Catholic Church. The white zucchetto is typically worn by the Pope, while cardinals wear red ones.
The defining costume color of a Roman Catholic Cardinal is scarlet red. The daily wear of a Cardinal is a cassock, a long button-front robe that is ordinarily black, except in the tropics where it may be white. The Cardinal's cassock is trimmed with red and worn with a broad red sash around the waist. More formal wear is the Choir Vestment or Choir Dress outfit, featuring a scarlet red cassock, over which is worn a white lace-trimmed robe called a rochet, along with a scarlet red cape called a mozzeta, and a scarlet red hat (biretta) or cap.
It symbolizes their willingness to die for their Faith.
Cardinals, those Bishops and Archbishops who vote for the new Pope, were originally just the clergy of Rome. The custom of having the clergy of Rome vote for the new Pope is maintained through the use of Titular Churches.from Modern Catholic Dictionary by John A. Hardon, S.J. Doubleday & Co., Inc. Garden City, NY 1980Titular Church. The particular ancient church in Rome over which a new cardinal receives jurisdiction on receiving the red hat. The name of the church is regularly given in all official listings of the cardinals of the Catholic Church.
In the Catholic Church, Bishops, Archbishops, and Cardinals wear the pinkish red hats called a biretta (pronounced ba-ret-a). The biretta, a 4 cornered hat, has 3 points which refers to The Trinity. See this biretta.
The red hat club
Cardinals typically wear a red skullcap called a zucchetto on their head. It is a traditional head covering for clergy in the Catholic Church, including cardinals.
They don't, Catholic Cardinals wear a cardinal red zucchetto - which looks an awful lot like a "skull cap" but isn't. Actually, all clerics may wear a zucchetto, priests wear black, bishops wear purple or violet, Cardinals wear red, and the Holy Father wears white.
Initially it was just called "Red Hat Linux", but now Red Hat focuses exclusively on the enterprise market with its Linux distribution named "Red Hat Enterprise Linux" (RHEL) with the community version named CentOS (Community ENTerprise Operating System) and Fedora (a Red Hat-supported community Linux distribution)
The Golden Hat