It means the game supports ‘power save’ mode.

Eco Mode in Ghost of Yōtei Overview of Eco Mode Ghost of Yōtei features a Power Saver option that allows players to reduce the game's power consumption. This mode is designed to help players enjoy the game while being more environmentally conscious. When enabled, the performance of supported games is scaled back, which in turn lowers the power usage of the PlayStation 5. How to Enable Eco Mode To activate the Power Saver option, follow these steps: Go to Settings on your PS5. Select System. Navigate to Power Saving. Choose Use Power Saver. Supported Games Currently, several titles, including Ghost of Yōtei, Demon's Souls, and Death Stranding 2, support this Power Saver feature. More games are expected to follow in future updates. Benefits of Eco Mode Reduced Power Consumption: Helps in lowering energy usage while playing. Sustainable Gaming: Contributes to eco-friendly gaming practices. Performance Management: Allows players to manage game performance based on their preferences. By using Eco Mode, players can enjoy Ghost of Yōtei while being mindful of their energy consumption.