The cardinal’s hat is a symbol of Archbishop’s title of Her Eminence.
The twelve tassels represent the twelve apostles.
The dove is a symbol of the Holy Spirit. It is taken from the story of Jesus' baptism, where the Spirit descended on him in the form of a dove. The three-rayed nimbus around its head identifies the Spirit as a member of the Trinity.
The crosier is an ecclesiastical ornament which is conferred on bishops at their consecration and on mitred abbots at their investiture, and which is used by these prelates in performing certain solemn functions.
The nine-pointed star symbolizes the nine fruits of the Spirit listed in the Epistle to the Galatians. This star is sometimes shown with the Latin initials for each of the fruits (charitas, gaudium, pax, longanimitas, benignitas, bonitus, fides, mansuetudo and continentia) placed within the points.
Oil was used in the Old Testament as a sign of consecration to the Lord. It was symbolic of God's call and empowerment of persons for specific tasks. In a New Testament context, oil represents the Holy Spirit Who indwells believers and seals them in Christ.
A book most commonly represents the Word of God, the Bible. An open book represents truth or revelation. In the hands of an Apostle, a book represents the writings of the New Testament (Old Testament writings are usually represented by a scroll). A book is used in the emblems of many saints, among them John the Baptist, Stephen, Bartholomew, Matthias and Simon.
The mitre representa the consecration to the episcopacy.
The ewer and basin are used for cleansing, and so represent ritual purity. They call to mind two related biblical stories whose meanings are quite different. The first is Jesus' washing of His disciples' feet after the Last Supper. In this act He expressed the heart of servanthood that was to characterize His disciples. The second is that of Pontius Pilate washing his hands of Jesus and protesting innocence of His blood. Pilate missed the irony that Jesus died for the sins of everyone.
The sword has many symbolic uses. It is an emblem, often combined with scales, of the archangel Michael, the captain of the hosts of heaven. It may be used to represent the enmity of unbelievers toward Christians. A sword is the emblem of many saints and martyrs, such as St. Paul and others too numerous to name, who died by the sword.
The Patriarchal Cross: This is an ecclesiastical cross that is often seen carried by the patriarchs in works of art. The upper bar represents the inscription placed on the cross by Pilate. It was adopted by cardinals and archbishops as a hierarchical distinction.
The keys represent the authority of the church to forgive sin in Jesus' name. Two keys represent dual authority to open heaven to repentant sinners and to lock heaven to the unrepentant. When emblazoned on an upside-down cross, they form the coat-of-arms of St. Peter who, according to tradition, asked that his cross be mounted upside-down because he felt unworthy to be crucified like his Lord.
Grapes are symbolic of Holy Communion and of the blood shed by Jesus on the cross for the forgiveness of sin. Grapes are also symbolic of the fruitfulness of the Christian life.