Cakka: 'wheel', is one of the seven 'precious possessions' ratana of a righteous World Emperor cakkavatti'He who owns the Wheel,' cf. D. 26, and symbolizes conquering progress and expanding sovereignty. From that derives the figurative expression dhamma-cakkam pavatteti, he sets rolling the Wheel of the Law' and the name of the Buddha's first sermon, Dhammacakkappavattana Sutta.
Another figurative meaning of C. is 'blessing'. There are 4 such 'auspicious wheels' or 'blessings': living in a suitable locality, company of good people, meritorious acts done in the past, right inclinations A. IV, 31.
References[]
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.