What does the LED indicator on my Acaia Lunar indicate?

Left:

• Lightning - power charge indication (the Lunar is plugged into a power source)
• Dot - short flash = Key press indication
• Dot- long flash = Bluetooth connected

Right:

• Dot - Ounce mode 
• Droplet - Timer starts when liquid flow detected
• Triangle - Timer starts when auto-tare performed
• Square - Automatically tares any weight except flow detected

For a more thorough description of the Lunar's modes, see our blog post about it.

Since this blog post, the Lunar's firmware has been updated. To see the added modes and changes, see this post about Lunar firmware 2.6.003.