'g' stands for something different every gRPC release:

• 1.0 'g' stands for 'gRPC'
• 1.1 'g' stands for 'good'
• 1.2 'g' stands for 'green'
• 1.3 'g' stands for 'gentle'
• 1.4 'g' stands for 'gregarious'
• 1.6 'g' stands for 'garcia'
• 1.7 'g' stands for 'gambit'
• 1.8 'g' stands for 'generous'
• 1.9 'g' stands for 'glossy'
• 1.10 'g' stands for 'glamorous'
• 1.11 'g' stands for 'gorgeous'
• 1.12 'g' stands for 'glorious'
• 1.13 'g' stands for 'gloriosa'