If you want to set some alias name to installed node version, do:
nvm alias <name> <version>
Similary to unalias, do:
nvm unalias <name>
A proper usecase would be, if you want to set some other version than stable version as default alias. default
aliased versions are loaded on console by default.
Like:
nvm alias default 5.0.1
Then every time console/terminal starts 5.0.1 would be present by default.
Note:
nvm alias # lists all aliases created on nvm