'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'
• 1.14 'g' stands for 'gladiolus'
• 1.15 'g' stands for 'glider'
• 1.16 'g' stands for 'gao'
• 1.17 'g' stands for 'gizmo'
• 1.18 'g' stands for 'goose'
• 1.19 'g' stands for 'gold'
• 1.20 'g' stands for 'godric'
• 1.21 'g' stands for 'gandalf'
• 1.22 'g' stands for 'gale'
• 1.23 'g' stands for 'gangnam'
• 1.24 'g' stands for 'ganges'
• 1.25 'g' stands for 'game'
• 1.26 'g' stands for 'gon'
• 1.27 'g' stands for 'guantao'
• 1.28 'g' stands for 'galactic'
• 1.29 'g' stands for 'gringotts'
• 1.30 'g' stands for 'gradius'
• 1.31 'g' stands for 'galore'
• 1.32 'g' stands for 'giggle'
• 1.33 'g' stands for 'geeky'
• 1.34 'g' stands for 'gauntlet'
• 1.35 'g' stands for 'gecko'
• 1.36 'g' stands for 'gummybear'
• 1.37 'g' stands for 'gilded'
• 1.38 'g' stands for 'guadalupe_river_park_conservancy'
• 1.39 'g' stands for 'goofy'
• 1.40 'g' stands for 'guileless'
• 1.41 'g' stands for 'goat'
• 1.42 'g' stands for 'granola'
• 1.43 'g' stands for 'green'
• 1.44 'g' stands for 'great'
• 1.45 'g' stands for 'gravity'
• 1.46 'g' stands for 'golazo'
• 1.47 'g' stands for 'gridman'
• 1.48 'g' stands for 'garum'
• 1.49 'g' stands for 'gamma'
• 1.50 'g' stands for 'galley'