Help deciphering an image [link provided]

[yo56]

Hello, I saw a picture online and I'm trying to figure out what it means.

Here is the photo.

Can someone please decipher?

It looks like it could have been been printed on a piece of fabric, maybe a T-shirt.

Thanks in advance!

 

[Hepth]

I think its a joke about being able to draw the Greek lower-case symbol "xi" correctly : $\xi$, something us physicists never really learn...

 

[yo56]

Lol! I think you're right!