fixed loop, very safe. You can use it when climbing and lifesaveing
etc. If your life depends on this knot, you should do an extra knot to
make it safer. Otherwise it will not be safe enough, especially if the
rope is new. Often learnt by thinking of the end as a rabbit, and the
loop as its hole, and as Elma Fudd would say: The wabbit gows up, out of
his hole, wound the back of the twee, and back down into his buwwow!