The lotus flower represents a symbol of fortune in Buddhism. It grows in muddy waters, and it is this environment that gives the flower's first and most literal meaning: to rise and bloom above darkness to achieve enlightenment.
The second meaning, which is related to the first, is purification. It is likened to the purification of the spirit that is born in darkness. The third meaning refers to faithfulness. Those who are working to rise above the muddy waters will need to be faithful followers.