Lady Luck Ladybug is a perfect symbol of western Lady Luck and Roman goddess Fortuna. This fickle lady has been known to bring good luck - or bad. Yet, she never ran out of worshipers, especially among gamblers.
Ladybug, on the other hand, on top of being luck personified, also represents love, joy and prosperity. And, seven black dots on her back correspond to Seven Joys of Virgin Mary.
Symbolism and Traditions of Ladybug or Ladybird
During the Middle Ages it was common belief that the ladybug symbolized protection. Stories were told about farmers who were desperate because aphids were ruining their crops. The farmers prayed to the Virgin Mary for help.
The Virgin Mary responded to their distressed situation and sent thousands of ladybugs to annihilate the aphids. And thus, saving their crop.
The ladybird has been and still is used as a talisman for safety and protection against all harm.
As a symbol of keeping the person wearing images of ladybugs safe and healthy, we can see why ladybugs on baby and child clothing is consistently popular. Source
Lady Luck Definition
Lady Luck is a westernized expression of the Roman goddess of luck, Fortuna. Fortune's decisions in whether to provide good or bad luck in any given situation was a casting of lots (i.e. a gamble.) She might bring good or bad luck, who knows? Except the lot in her hand - where it will land? Fortune was not perceived by the Romans as literally blind (for she must read the lot). Her blindness was a metaphor. She herself did not know what fate she would make. Her predictions were built on whimsy. Yet, in sculptures she sometimes was presented as blind or with a blindfold. As exemplified in contemporary depictions of Lady Justice.
Thus, the terminology "Lady Luck" refers primarily to the concept of not having certainty in a particular outcome. For Lady Luck (i.e. Fortuna) has already picked up another lot to be cast!