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.
Maslow's (1943, 1954) hierarchy of needs is a motivational theory in psychology comprising a five tier model of human needs, often depicted as hierarchical levels within a pyramid. Maslow stated that people are motivated to achieve certain needs and that some needs take precedence over others.
Image Source: http://kuow.org/post/how-did-abraham-maslow-change-psychology. Abraham Maslow was a renowned psychologist whose biggest contribution to the field of psychology is the Maslowâs Need Hierarchy theory. He believed that all human beings strive to achieve satisfaction in life through the fulfillment of certain needs.