'g' stands for something different every gRPC release:

- 1.0 'g' stands for ['gRPC'](https://github.com/grpc/grpc/tree/v1.0.x)
- 1.1 'g' stands for ['good'](https://github.com/grpc/grpc/tree/v1.1.x)
- 1.2 'g' stands for ['green'](https://github.com/grpc/grpc/tree/v1.2.x)
- 1.3 'g' stands for ['gentle'](https://github.com/grpc/grpc/tree/v1.3.x)
- 1.4 'g' stands for ['gregarious'](https://github.com/grpc/grpc/tree/v1.4.x)
- 1.6 'g' stands for ['garcia'](https://github.com/grpc/grpc/tree/v1.6.x)
- 1.7 'g' stands for ['gambit'](https://github.com/grpc/grpc/tree/v1.7.x)
- 1.8 'g' stands for ['generous'](https://github.com/grpc/grpc/tree/v1.8.x)
- 1.9 'g' stands for ['glossy'](https://github.com/grpc/grpc/tree/v1.9.x)
- 1.10 'g' stands for ['glamorous'](https://github.com/grpc/grpc/tree/v1.10.x)
- 1.11 'g' stands for ['gorgeous'](https://github.com/grpc/grpc/tree/v1.11.x)
- 1.12 'g' stands for ['glorious'](https://github.com/grpc/grpc/tree/v1.12.x)
- 1.13 'g' stands for ['gloriosa'](https://github.com/grpc/grpc/tree/v1.13.x)
- 1.14 'g' stands for ['gladiolus'](https://github.com/grpc/grpc/tree/v1.14.x)
- 1.15 'g' stands for ['glider'](https://github.com/grpc/grpc/tree/v1.15.x)
- 1.16 'g' stands for ['gao'](https://github.com/grpc/grpc/tree/v1.16.x)
- 1.17 'g' stands for ['gizmo'](https://github.com/grpc/grpc/tree/v1.17.x)
- 1.18 'g' stands for ['goose'](https://github.com/grpc/grpc/tree/v1.18.x)
- 1.19 'g' stands for ['gold'](https://github.com/grpc/grpc/tree/v1.19.x)
- 1.20 'g' stands for ['godric'](https://github.com/grpc/grpc/tree/v1.20.x)
- 1.21 'g' stands for ['gandalf'](https://github.com/grpc/grpc/tree/v1.21.x)
- 1.22 'g' stands for ['gale'](https://github.com/grpc/grpc/tree/master)