zodiac killer theory

DR ! EAT A TORPEDO ( Z13)

z32 PI

Alfred E. Neuman z13 "What, me worry?

The Hidden Mathematical Symmetry of the Z408 Cipher's Final Segment

The Typewriter Secret: How the QWERTY Layout Might Unlock Zodiac’s Name (Z13)

The Cyclic Matrix of Z408: Speculation, Geometry, and the Evolution of the Zodiac Ciphers