Various property interests in Torrens system land can be registered in addition to ownership. This includes mortgages and charges over a particular parcel of land. A search of the relevant register will disclose these 'encumbrances'.
Not all interests in land are registrable (for example, interests that are recognised only in equity) but, in some circumstances, it is possible to get a special notation called a 'caveat' put on the register, which gives notice of such interests. The name 'caveat' comes from the Latin word meaning 'beware'. If a caveat is entered on the folio of a parcel of land, this will prevent anyone else, such as a purchaser, registering another interest in the land.