Hi,
Even though my user stats show me as completely new I've actually been a
member for a few years under the username 'Ezekial' which is giving me
strife (cannot recover old password).
Anyhow onto the topic of my return to this great website (I've been away for
quite a while for work).
At work today this rather bizarre old guy came into the customer service
section of our electronics repair lab and after buying a few bits and
pieces (it was his second time in the shop for the day).
No offensive to French people but I couldn't understand his very think
accent but he rambled on asking how many staff we have and a few other
questions which I answered, to which he gave me 3 cards with the same
cryptic message on them (attached links).
Front side
Back side
Now I believe I have seen these before but where from I have no idea.
My ideas/sandbox theories on symbols and their meaning.
The text on the front of the card was a little hard to read so I went over
it with a pen and it reads:
PM DIXIT (or) DIXTT ET AL E TU
Some of which sounds like french;
"et al" which translates to the english "et al." = "and others"
"tu" translates to "you"
I cannot find anything for DIXIT/DIXTT.
PM I guess is = PostMeridiem
____________________________
In the top left corner is what looks to be a hand written 'y'  I checked
this under a microscope and there is a depression in the paper and it
embosses onto the other side. Or could it be a badly drawn 'gamma'?
if gamma is this pointing out that the card is a gamma function similar to a zeta
function?
γ represents:
* the lower incomplete gamma function
* the third angle in a triangle, opposite the side C
* the EulerMascheroni constant in mathematics.
* secondorder sensitivity to price in mathematical finance
* the Lorentz factor in special relativity

en.wikipedia.org...
The top half of the front seems to be an equation after the lightglobe
(idea/bright?)
Inside the square is the symbol lowercase epsilon:
ε represents:
* a small positive quantity; see limit
* a random error in regression analysis
* in set theory, the limit ordinal of the sequence\omega,\omega^[\omega],\omega^[\omega^[\omega]],\dots.
* in computer science, the empty string.
* the LeviCivita symbol. * in electromagnetics, dielectric permittivity.
* emissivity
* strain
* set membership symbol ∈ is based on ε

en.wikipedia.org...
The formula consists of (and these are my theories):
FRONT SIDE
u = "you (me in this context?)"
= = "is equal to"
[] = "set brackets" [a,b,c] means the set consisting of a, b, and c
= Lower case alpha
α represents:
* the first angle in a triangle, opposite the side A.
* one root of a quadratic equation, where β represents the other
* the statistical significance of a result
* the false positive rate in statistics
* the reciprocal of the sacrifice ratio
* the fine structure constant in physics
* the angle of attack of an airplane
* an alpha particle (He+2)
* angular acceleration in physics
* the linear thermal expansion coefficient

en.wikipedia.org...
: = "inner product of" but these are usually done with '?,?' or (), ':' is used in matricies.
± = "plusminus" however again two contexts; both '1+1 and 11' AND 10 ± 2
or eqivalently 10 ± 20% means the range from 10 − 2 to 10 + 2 (does the fact its superscripted mean anything?
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[edit on 562007 by Zeeko]