Noun
a two-dimensionsal figure having the shape of the number eight
Source: WordNetIn the UK The London Fat Women's Group was formed, the first British fat activist group, and was active between approximately 1985 and 1989. citation Other first wave activities included the productions of zines such as Figure 8 and Fat! Source: Internet
Thus the "correct" way to view Figure 8 is to imagine the x-axis as pointing towards the observer and thus seeing a concave corner. Source: Internet