For most of us charcoal means one thing - barbecues! But good quality home made charcoal can also be used to make effective DIY water filters and it can also be used to treat poisoning when consumed in small quantities .
Vegvisir ("the viking compass"). It is said that if this sign is carried, one will never lose one's way in storms or bad weather, even when the way is not known. It is encircled by protection runes. This would be a cool tattoo.