What Could the Hidden Math Formula on This Shirt Be?

[RaamGeneral]

Hi. I apologize if this thread is too stupid or if this is the wrong section.

I made a drawing a long time ago:


This should be "random man", and I bet that in his shirt there is something math/physics-related, maybe a formula. Do you have any idea? I don't remember and nothing comes to mind.

I know the clues aren't great, but I figure it's worth a try.

 

[DaveC426913]

Is this a recent photo?
Can you post a better one?

It took me a few moments to realize that his head is a question mark.

Here is the logo enlarged and enhanced.
Unfortunately, Gigapixel couldn't do anything with it to bring out any further details.

 

[RaamGeneral]

Damn, must be hopeless then. I took the picture some time ago, maybe with another phone, I don't know, maybe it was night and the light in my room was weak. I remember that I tried to take multiple pictures because the writing wasn't visible, but to no avail, then I gave up. The drawing was lost...

Fun fact: I presume that the question mark was willingly resembling a face somehow.

 

[DaveC426913]

The drawing was lost...

Why not just recreate it? you've got a screen cap to work from...

 

[DaveC426913]

Upside down it says "Spam"...