Phalaenopsis, or moth orchids, come in a myriad of colors, displaying exotics patterns and intricate designs. The Phalaenopsis is only one of the 780 genera of orchids. When calculating all the species, there are over 28,000 types of orchids.
Inside the genus of Phalaenopsis, there are 60 unique orchids, all pertaining to the same specifications. I won’t cover all 60 of course, but group them by colors, which I can narrow down to 6. I'm leaving out all the thousands of colors in between, too.
Yellow Moth Orchids symbolize a strength of a job well done. The accomplishment of a hard task, in which the person not only finished, but excelled. Yellow Phalaenopsis are given among friends—not lovers. The yellow moth orchid symbolizes a tie that goes beyond the hardships of life, and signifies the happiness of being together.
Yellow is related to the happiness—the happy face is yellow. Spring tulips are almost always associated with the color yellow (which also ties into the meaning of the yellow moth orchid: overcoming with success a hard obstacle—in this case, overcoming winter).