Sudarshana cakra
SB 9.5 summary…What is this Sudarśana cakra? The Sudarśana cakra is the glance of the Supreme Personality of Godhead by which He creates the entire material world. Sa aikṣata, sa asṛjata. This is the Vedic version. The Sudarśana cakra, which is the origin of creation and is most dear to the Lord, has thousands of spokes. This Sudarśana cakra is the killer of the prowess of all other weapons, the killer of darkness, and the manifester of the prowess of devotional service; it is the means of establishing religious principles, and it is the killer of all irreligious activities. Without his mercy, the universe cannot be maintained, and therefore the Sudarśana cakra is employed by the Supreme Personality of Godhead. When Mahārāja Ambarīṣa thus prayed that the Sudarśana cakra be merciful, the Sudarśana cakra, being appeased, refrained from killing Durvāsā Muni, who thus achieved the Sudarśana cakra’s mercy.
May 5 1960 BTG magazineThe Lord said to Durbasha Muni who picked up a quarrel with a great householder devotee namely King Amburish. As a result of misunderstanding between the King and the Muni, the latter tried to kill the King when Sudarshan Chakra, the celebrated weapon of Godhead, appeared on the scene for protection of the devotee King. When Sudarshan Chakra attacked Durbasha Muni he fled away frightened by the weapon and sought shelter practically from all big Gods of the heaven. Everyone was unable to protect him so ultimately he approached the Personality of Godhead who also sent the Muni to beg pardon from the King and glorified His devotees by saying, “The saints are my heart and I am also their hearts. They do not know anything besides myself and reciprocally I also do not know anyone else besides them.”
SB 3.1.23 purport…The Lord expands Himself in innumerable forms, but all of them are nondifferent from one another. Lord Viṣṇu has four hands, and each hand holds a particular item—either a conchshell, wheel, club or lotus flower. Of these four emblems, the cakra, or wheel, is the chief. Lord Kṛṣṇa, being the original Viṣṇu form, has only one emblem, namely the wheel, and therefore He is sometimes called the Cakrī. The Lord’s cakra is the symbol of the power by which the Lord controls the whole manifestation. The tops of Viṣṇu temples are marked with the symbol of the wheel so that people may have the chance to see the symbol from a very long distance and at once remember Lord Kṛṣṇa
SB 3.15.27 purport…The significance of the doormen’s being of the same age is that in the Vaikuṇṭha planets there is no old age, so one cannot distinguish who is older than whom. The inhabitants of Vaikuṇṭha are decorated like the Supreme Personality of Godhead, Nārāyaṇa, with śaṅkha, cakra, gadā and padma (conch, wheel, club and lotus).SB