One of many colors.
- The color of a Bard's Sash.
- A blue magic ball is a Force Bolt.
- Blue is the color associated with a 2nd level order of the warrior.
- In Heraldry Light blue is called "Celestria", and Dark blue is called Azure.
- In Medieval Europe Azure or blue was thought to signify loyalty and truth.
- In Hinduism, Blue is used to symbolically represent the fifth, throat chakra
- In the English language, blue often represents the human emotion of sadness, e.g. "He was feeling blue". In German, on the other hand, to be "blue" (blau sein) is to be drunk. This derives from the ancient use of urine (which is produced copiously by the human body after drinking alcohol) in dyeing cloth blue with woad or indigo.
- Blue in Hinduism: Many of the gods are depicted as having blue-coloured skin, particularly those associated with Vishnu, who is said to be the Preserver of the world and thus intimately connected to water. Krishna and Ram, Vishnu's avatars, are usually blue. Shiva, the Destroyer, is also depicted in light blue tones and is called neela kantha, or blue-throated, for having swallowed poison in an attempt to turn the tide of a battle between the gods and demons in the gods' favor.
- In Thailand, blue is associated with Friday on the Thai solar calendar. Anyone may wear blue on Fridays and anyone born on a Friday may adopt blue as their colour. The Thai language, however, is one that has had trouble distinguishing blue from green. The default word for Blue was recently สีน้ำเงิน literally, the colour of silver, a poetical reference to the silvery sheen of the deep blue sea. It now means Navy Blue, and the default word is now สีฟ้า literally, the colour of the sky.
- Gemstones which can be blue, include diamond, sapphire, lapis, and turquoise.