When I clicked the Facebook link provided by this page, I got "Sorry, this content isn't available right now. The link you followed may have expired, or the page may only be visible to an audience you're not in."
It is likely that he deleted his Facebook post because he mentions wearing a keffiyeh, or 'Yasser Arafat scarf' as he calls it. It is far more plausible that this is what drew suspicion than his scribbling algebraic symbols on a page.
The keffiyeh is versatile. It can also be worn around the neck, tucked into the jacket. This way of wearing it became a fashion in the West in the mid to late '80s.
"Houndstooth, hounds tooth check or hound's tooth (and similar spellings), also known as dogstooth, dogtooth, dog's tooth, or pied-de-poule, is a duotone textile pattern characterized by broken checks or abstract four-pointed shapes, often in black and white, although other colours are used."
"Its distinctive standard woven checkered pattern may have originated in an ancient Mesopotamian representation of either fishing nets or ears of grain,[2] but the true origin of the pattern remains unknown."
Why would Guido Menzio delete this post?