AU

1. African Union
2. Ångström unit (also ÅU, now usu Å)
3. Astronomical unit

Au (chem)

Gold

• clews
• clew up
• clianthus
• clianthuses
• cliché
• cliché'd
• clichéd
• clichéed
• cliché-ridden
• clichés
• click
• clickable
• clickbait
• click beetle
• click beetles
• click-clack
• click-clacks
• clicked
• clicker
• clickers
• clicket
• clicketed
• clicketing
• clickets
• clickety-clack