| Alias(es) | Akeru, Akerui |
| Domain |
He guards the gates of the dawn from which the sun rose each morning. He also opens the earth's gate for the king to pass into the Underworld. He imprisons the coils of the snake Apophis after being hacked to pieces by Isis. Aker could provide a secure passage along his back for the sun-god's boat travelling from west to east during the hours of night. |
| Portrayel | A double-headed lion, or as two lions sitting back-to-back. Inbetween them is shown the sun with the sky overhead. The two lions were called Sef and Duau, which means "Yesterday" and "Today" respectively. |
| Parents | Nun |
| Center of worship | Heliopolis |