Asus Eee PC R252C - Manual (Page 13)

ASUS 1225/R252 Series 1-5
Hard Disk Drive (HDD) Indicator
The hard disk drive indicator blinks when data is written to
or read from the disk drive.
Wireless/Bluetooth Indicator
This is only applicable on models with built-in wireless LAN/
Bluetooth (on selected models). When the built-in wireless
LAN/Bluetooth is enabled, this indicator lights.
Capital Lock Indicator
When this indicator lights up, it indicates that the keyboard
is in capital lock mode.