Metaknowledge
Metaknowledge or meta-knowledge is knowledge about knowledge. Some authors divide meta-knowledge into orders: zero order meta-knowledge is knowledge whose domain is not knowledge (and hence zero order meta-knowledge is not meta-knowledge per se) first order meta-knowledge is knowledge whose domain is zero order meta-knowledge second order meta-knowledge is knowledge whose domain is first order meta-knowledge most generally, n + 1 {\displaystyle n+1} order meta-knowledge is knowledge whose domain is n {\displaystyle n} order meta-knowledge.