Hydra symbol
| Symbol | Hydra |
| Origin | Greek |
| Meaning | Regeneration, complexity, overcoming challenges |
| Appearance | Multi-headed serpent |
| Colors | Often depicted in shades of green |
| Usage | Hercules's second labor was to slay it |
| History | A serpentine water monster with regenerating heads |
| Popularity | Moderate |
| Importance | Symbolizes the challenges that persist and regenerate |
| Complexity | Perseverance, overcoming challenges |
| Emotions | Perseverance, overcoming challenges |