rust:
• has an ecosystem where many famous parts are named with a [metal](https://crates.io/crates/iron) or [decay](https://github.com/jameysharp/corrode) or industrial/engineering [(1)](https://doc.rust-lang.org/stable/cargo/) [(2)](https://diesel.rs/) [(3)](https://github.com/Smithay) [(4)](https://rocket.rs) theme
• has a mascot whose name is a pun on “ferrous”
• has a bicycle gear for a logo
also rust: ackshually it's named after [these fungi](https://en.wikipedia.org/wiki/Rust_(fungus))