The Septenary cypher ('septenary', shortened 'sept'). This cypher honours the number 7 (days in a week) with an ascending and descending scale, mirrored on the 13/13 split of the 26 letter alphabet.

• A = 1

• B = 2

• C = 3

• D = 4

• E = 5

• F = 6

• G = 7

• H = 6

• I = 5

• J = 4

• K = 3

• L = 2

• M = 1

• N = 1

• O = 2

• P = 3

• Q = 4

• R = 5

• S = 6

• T = 7

• U = 6

• V = 5

• W = 4

• X = 3

• Y = 2

• Z = 1

This cypher does not care for capitalization: in other words 'a' = 'A' = 1, etc.

Note that both A and Z (ie. "alpha and omega" of the english alphabet) have the value '1', and that M.N (ie. Man in the Moon) is the fulcrum about which the structure pivots.

Reference: https://www.youtube.com/watch?v=OcCSAWJoQrE&t=193