As much meaning as you care to put on them. In certain cultures they may have specific meaning, but, like black cats and walking under ladders, the meaning is cultural rather than scientific.
For Christians, butterflies in general symbolizes the resurrection. The caterpillar dies and lives again in a new more glorious form.
Sunshine, joy and energy are symbolized by this sunny color. Are you on the 'yellow brick road', the metaphorical road to happiness? Do you need to consult the Yellow Pages? A yellow ribbon is asscociated with those awaiting the return of a loved one, especially someone in the military who is away fighting for their country.
Some in Christianity see 'yellow' as the alternative to gold. It is related to 'light' and the presence of God. See related link:
happiness, friendship
Same thing as it does in English.
bagtit
happiness
The Sun, banana, anything yellow
keen observation
a yellow penis
surrender
green or yellow.
it symbols protection
any shade will do as long as it is recognised as yellow
Early marriage, for women.
-yellow color- symbolizes mourning-yellow flowers- symbolize deathsunflowers- symbolize sunmerigolds- flower of the dead, they help bring back the soles of the past on the day of the dead
martin Luther king
Caution and warning, in general.
yellow flag by itself means healthy yellow flag flow with another means quarantine