**"PS. The Mt. Diablo Code concerns Radians & # inches along the radians".**The answer would be about

**radians**and

**inches**. With the northern section of the map crosshairs positioned at zero and to be set to magnetic north, the Zodiac Killer gave us the value of 4 radians and magnetic north (246 degrees) by the placement of the bold, black circle within the first crosshairs on the Little List letter.

The target was the San Francisco Police Department at Ingleside (SFPD). The

**second set of crosshairs**on the Little List letter contained the hashtag (number sign) in the phrase above, with an arrow placed underneath, beckoning us to insert a number before inches. Only 4 radians and magnetic north, coupled with 5 inches could ever fall over San Francisco, constrained by its land mass. No other values can meet the requirement of targetting SFPD. To an overall accuracy in excess of 98%, the location of the bomb was to be set on the embankment of the Southern Freeway just 274 feet from Ingleside Police Station. For the full story, read

**The Answer to the Mount Diablo Code.**

My solution to the 32-Symbol code in the above article did not marry up the ciphertext to the plaintext adequately, however, Druzer, an invaluable contributor to both Zodiac Killer forums, supplied a solution that married up the three repeating ciphertext characters with corresponding plaintext characters. His solution took

**"PS. The Mt. Diablo Code concerns Radians & # inches along the radians".**into

**"four radians and five inches"**that satisfied the requirement of the Zodiac Killer's Mount Diablo code. This would ultimately provide us with 24 of the plaintext characters for the solution, leaving us 8 ciphertext characters to decode. Druzer came up with the answer, but how was this achieved?

**"four radians and five inches"**within the 32-Symbol array. We needed an entry point. The clue had to exist within the ciphertext characters themselves. Two of the most notable ciphertext characters were the

**Anchor**and

**Omega**symbols (the latter of which had never been used before), so possibly it was this symbol that held the key of where to insert

**"four radians and five inches".**

**radian per second**(symbol:

**rad⋅s−1**or

**rad/s**) is the SI unit of angular velocity, commonly denoted by the Greek letter

*ω*(omega). The radian per second is also the SI unit of angular frequency. The radian per second is defined as the change in the orientation of an object, in radians, every second.

Using this as the entry point in our ciphertext characters, the word

**"radians"**was placed at the beginning of the Omega sign in the code, hoping that the 24 plaintext characters of

**"four radians and five inches"**would travel to the end of the code. Inserting

**"four"**before

**"radians",**It fell into the code seamlessly (as shown below).

**∆**to the three repeating ciphertext characters in the first section of the code, like so.

**(4 radians}**and 4.84 inches

**(5 inches)**from Mount Diablo, so the Zodiac Killer was rounding off his values and giving us an estimate. As can be seen in the above diagram, the word

**"estimate"**fits perfectly into the first eight characters of the code, giving us the final answer to the 32-Symbol code of

**"estimate: four radians and five inches".**The Zodiac Killer was informing us that the answer to the Mount Diablo code of

**"four radians and five inches"**was just an estimate to the location of the bomb at Ingleside Police Station (SFPD).

**With immense gratitude to Druzer, who supplied the code images used.**