Vi

is a powerful "modal" text-based editor with a long history in the Unix(like) operating system. The original vi has served as a basis for many clones and derivatives over the years, notably vim.

Although not part of the GNU Coreutils, a vi(like) editor is almost universally included in Linux distributions.

Gentoo installs nano by default, emerge a package from the following section to provide a vi(like) editor.

Available software
More vi(like) editors can be found online in the app-editors category or by running:

Launch vi(like) editor
The vi(like) editor can usually be launched with the command. Neovim is launched with the command.

If a vi(like) editor is not installed, busybox's vi may be available:

/usr/bin/vi symlink
If Vim is installed, the and  commands become synonymous due to the following link:

Use to manage this link, from the  package. can currently select between the following: vim, nvim, nvi, elvis, vile, gvim, qvim, xvile, pyvim, and busybox.

The synonymous use also holds when setting editor defaults.