A heart is used to symbolize the emotion of love. Humans have long associated the feeling of love with the heart. The organ used to pump blood around the body. The symbol for Valentine's Day is a heart. A yellow (gold) heart can symbolize friendship, happy, and trustful love. Compassionate and respectful. People are said to have a "heart of gold" when they are honest and caring.
Emoji History The emoji code/ image log of changes.
This emoji was part of the proprietary / non-standardized emoji set first introduced by Japanese carriers like Softbank. These emojis became part of the Apple iPhone starting in iOS 2.2 as an unlockable feature on handsets sold in English speaking countries.
In iOS 5 / OSX 10.7, the underlying code that the Apple OS generates for this emoji was changed.