Like I said, mine is somewhere in storage, so this image comes from Coyote's Paw.
Here in the Emirates it's not worn, but in Yemen it is still worn by many as an accessory. However it's generally considered taboo to unsheathe it in public. I personally prefer hanging it on a wall. Another possible souvenir for my professor is a traditional Arabic coffeepot. These are actually featured on the money in this country:
Image from Wikipedia: With this, you may purchase a can of coke. It's about 28 cents. Go figure that out the next time you're at a vending machine.
Coffee is an important part of traditional social customs here. I'm not such a big fan of Arabic coffee though, everyone tells me it's really bitter/strong. Even people who positively hate the stuff tell me this. I personally think it tastes like nothing- boiled water. I really don't detect any taste. As such I can't say I love or hate it, it just is. Turkish coffee on the other hand, I love, and I have yet to taste anything stronger. It's a lot more common here- you can find it in most cafes.
Pretty much anything would catch the interest of my professor in this case, and I'm not too worked up about it, but I've always found it difficult to assess the relative value of souvenirs. I mean, think about it, knives and coffeepots are pretty much household items. I wonder if people in the future will ever see that sort of thing as a matter of cultural heritage.
"And here, we sell the old-fashioned Wii. A long time ago, people used to stand in front of these big boxes called televisions for entertainment (this was before brainfeeds) and used it to play primitive games. I can sell you separate stands for the controllers if you don't want to mount them."