Using lower case letters, could the last 18 characters of the 408 be an equation?
The last four characters ‘piti’ when read backwards spell ‘i tip’. Tipping or turning the ebeorietemethhpiti 180 degrees looks something like this:
!t!d 44 t 2w2 t 2! ro 292
!t!d 44 + 232 + 21 ro 292 or !t!d 297 ro 292
4=h
+=t
2=e
3=m turned 90 degrees
1=i
r=r
o=o
9=b
!t!d already used for ‘itip’
Zodiac could have switched the position of the ‘ro’ so when turned it would read ‘or’ but he didn’t. So maybe it’s meant to be read from right to left like the ‘i tip’. Reoriented to read left to right looks like:
292 or 12 + 232 + 44 d!t! or 292 or 288 d!t!
Another orientation of ebeorietemethhpiti
When taking the last 18 characters and tipping it from bottom to top and read it from the back side of the paper or hold it up to a mirror you get something that looks like this:
6p6 or !6 t 6w6 t 44 b!t!
696 or 16 + 636 + 44 b!t! or 696 or 696 bit!
6= e
9=p
o=o
r=r
1=i
+=t
3=m turned 90 degress
4= h flipped horizontally
696 or 696 bit! has symmetry and the word ‘bit’ at the end was interesting. ‘Bit’ has several meanings, the one definition that struck me was, "The part of a key that engages with the lock lever".
Zodiac could have used a ‘d’ so when tipped it would be a ‘9’ but he didn’t. So maybe it’s suppose to be a ‘p’. If so could 6p6 mean
permutation? Value would be 720.
Yet another orientation of ebeorietemethhpiti would be to rotate and then tip. With the ‘e’ turning to a ‘9’.
I’m sure there’s more ways to interpret the ebeorietemethhpiti as an equation. An ‘!’ could stand for the math symbol factionial. Maybe some of the letters should be capitalized, possibly revealing yet more math symbols.
If it is an equation of some kind, where is it used? Presumably on the 408. If so, all of it or a section? The section it came with or a word?
Is it the equation itself?
The word ‘tip’ is found vertically oriented in the second section of the 408 connecting with the word ‘paradice’ looking like this:
t—–t
i—–i
paradice
Which is what lead me to observing the last four characters of the 408 as possibly reading ‘i tip’.
This is a pretty elaborate clue for someone who couldn’t even spell "dangerous" correctly in his own code.
But at least we know that Zodiac never stiffed anyone at a restaurant. 
“Murder will out, this my conclusion.”
– Geoffrey Chaucer
Hey Chaucer, thanks for the reply
If Zodiac did misspell words from ignorance that doesn’t necessitate him being unable to create an elaborate clue or code. He came up with the 340 cipher that has yet to be cracked.
I lean heavily towards the possibility he misspelled words on purpose.
Yeah, should never stiff anyone at a restaurant….or anywhere else for that matter 
292 or 12 + 232 + 44 d!t! or 292 or 288 d!t!
I don’t know that I find this convincing, but I will point out that "d!t!" could represent an infinitesimal (as in "dx/dt", if you know a little calculus)
Thanks DMW for pointing that out. I know nothing of calculus but will do a little
reading and see if I can at least grasp the concept of it.
Appreciate the reply =)
Following this logic, the "d!t!", by itself without a "d!x!" numerator, would indicate that this is probably meant to be an integral.
Again, though, I’m kind of skeptical of this. Z didn’t even really use the word "radian" correctly, so I doubt that he was proficient with calculus.
