Ricky is a simple command line tool that will open a random Wikipedia article starting with the letter you provide:
ricky u
The command above for example might open the Wikipedia page for Uinta National Forest, Una Stubbs, or any other number of interesting articles.
If you're using macOS and have homebrew installed, you can install Ricky with:
brew install dnsbty/dnsbty/ricky
Otherwise, download the archive appropriate for your operating system and CPU
architecture from the latest
release. Unzip the archive
with tar -xvf ricky_X.X.X_{OS}_{ARCHITECTURE}.tar.gz and then move the ricky
file to somewhere in your path to make it easier to use.