I'm trying to find these types of names for certain Minecraft blocks to add them to a block whitelist for one of my mods. Is there an actual name for these? If not, how would I go about finding a list of or searching for them?
These are java package namespaces, based on the conventions for that language. See this question: https://stackoverflow.com/questions/2661698/java-com-package-namespace .
Namespaces are used to group together and scope different code components within a project.