A language, not a tool: Feature, Scenario, Given, When, Then, And.
The mark is Cucumber's, the runner that made it common. The garden does not run
Gherkin, but the shape is everywhere in it — an e2e spec named for what a
person does and sees, a bug report with its reproduction, a pull request's
verification table. The glossary entry says why the shape matters more than
the tool.