(The following is the interpretation of the school emblem as originally conceived by Fr. Thomas M. Mackessack, S.J. & Fr. Robert J. Mayer, S.J.)

The Coat-of-Arms of St. Xavier's School, originally designed by Fr. Thomas M. Mackessack, S.J., is majestic and meaningful. The beautiful symbolism contained in it provides a wealth of meaning and inspiration. At the top of the shield is emblazoned the lotus, the flower par excellence of India, signifying our country.

On the right below, the moon-like checkered and inverted crescent is taken from the coat of arms of the House of Xavier, symbolizing the special patronage of the Apostle of India, St. Francis Xavier, after whom our school is named. The third symbol in the crest is the sun like Jesuit sigillum or seal that indicates our school is conducted by the Society of Jesus, by Xavier's fellow Jesuits.

The sun like seal contains the name of Jesus, represented by 'IHS', the first three letters in Greek of the name of Jesus, surmounted by a cross. The Sun is a symbol of the light of knowledge and the quest for perfection. Jesus Christ said, "I am the light of the world." And he said this to his disciples: “You are the light of the world.” The inscription written at the bottom proclaims that St. Xavier's school was founded in 1960.

Our inspiring motto, Esto Vir (Be a Man/Play the Man), is taken from the parting instructions of King David to his son and royal successor, Solomon: “I am about to go the way of all flesh. Be strong, and SHOW YOURSELF A MAN (Esto Vir), and keep the charge of the Lord your God, walking in His ways and keeping his statutes and His commandments so that you may prosper in all you do.” (‘Esto Vir’ urges every Xaverian to become strong and courageous and take charge of one’s life by being responsible and self-dependent.)

On the outside, an eagle can be seen holding the shield with its wings. Since the eagle is famous for soaring high, it is used as a symbol of 'trying to reach the heights', reminding Xaverians of the watchword of St. Ignatius of Loyola: 'Seek the Greater Glory of God' (A.M.D.G = Ad Majorem Dei Gloriam). The two lions, standing on their hind legs and supporting the shield with their forefeet- similar to the four lions at the top of Ashok pillar, are meant to hold and uphold the dharma chakra, the wheel of order, and carry the spirit of law and order to the four corners of the land.

Like the two lions that hold the Xavier crest aloft, every Xaverian must protect and proudly proclaim the noble ideals of the Republic of India and its rich heritage, and the ideals of the Society of Jesus- the ideals for which Xavier lived and died. These ideals are enshrined in St. Xavier's School, Delhi, the ideals challenging all of us to be men and women for others.