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.
(Cardwell et al, 2000). On the basis of his theory he arranged these various needs in a hierarchy, starting with the basic survival needs and at the very top the self-actualisation need. (As pictured below). Maslowâs original Hierarchy of needs. (www.outlandishjosh.com/files/400px-Maslow's_hierarchy_of_needs.svg.png)