The word "continuous" on its own is an obsolete artifact supertype. In modern Magic, the word is primarily used to refer to continuous effects.
From the glossary of the Comprehensive Rules (Amonkhet (April 28, 2017))
- Continuous Artifact (Obsolete)
- An obsolete term that appeared on the type line of artifacts without activated abilities. Cards printed with this text have received errata in the Oracle card reference to simply say “Artifact.”