leading rein(n = noun.artifact) - rein to direct the horse's head left or right;
is a kind of rein

alaska rein orchid, bearing rein, bog rein orchid, coastal rein orchid, draw rein, free rein, leading, leading astray, leading edge, leading indicator, leading lady, leading light, leading man, leading off, leading question, leading tone, rein, rein in, rein orchid, rein orchis, round-leaved rein orchid