tet·rad
Noun
/?te?trad/
tetrads
plural
- A group or set of four
In Egyptian symbolism the number four frequently
signified the four cardinal directions and hence a kind of
spatial or geographic totality. This significance is seen in
the four "races" of mankind; Egyptians (north), Near Easterners
(east), Nubians (south) and Libyans (west) depicted in some New
Kingdom tombs. It is also apparent in a number of groupings of
four deities, such as the four supports of the sky which may be
personified as four individual deities or groups of deities
aligned with the four points or quarters of the heavens.
The connection is strong enough, in fact, that even when groups
of four deities do not seem to originally have this symbolic
significance it may become attached to them. Thus the mortuary
deities known as the four sons of Horus may some times be
aligned geographically in representational contexts although
this is not always the case. While the concept of completeness
associated with the number four may have sprung entirely from
the totality encompassed by the concept of the four cardinal
points, the symbolic use of the number is frequently one of
completion without any specific directional overtones at
all.
In the underworld books four forms of a given god or groups of
four deities are frequently found and thus depicted in
vignettes in the papyri and decorations of the royal tombs. An
interesting example of this king of tetrad is found in
Ramesside times when the god Seth was elevated to the extent
that he was sometimes named along with three great deities
Amun, Ra and Ptah. The four divisions of the Egyptian army were
named after Seth and the other three deities in a group which
clearly could be conceived as holding the symbolism of tactical
or strategic completeness. While the members of dyads and
triads are usually distinguished from one another in
representational works, the deities found in groups of four are
often undifferentiated - showing their apparently more
"generic" nature.
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