A Claymore anti-personnel mine looks like a dark green, slightly curved, slab with two pointy things that you stick in the ground. The explosion is directional, that's to say it blasts out of the convex side.
The mine (besides its blast effect) does damage with steel balls.
The Claymore was used in jungle warfare in Vietnam, often as part of an ambush.

The business side of the mine is helpfully labelled THIS SIDE TOWARDS ENEMY, a very good design idea if you ask me.