Maycom AR-108 User's Operation Manual page 4

11. " S-RF " (Signal strength indicator)
The radio incorporates a ten segment incoming signal on the LCD.
When receiving a signal, the meter will indicate how strong the signal is.
A weak signal will be indicated by one or two segments, while a very
strong signal will have 8 to 10 segments.
12. " BAT " (Battery remainder level meter)
Not Used
13. " " (Battery indicator)
Indicates batteries are getting low. If the battery level is lower than the
standard point, Battery Level Indicator will twinkle.
14. " " (Busy)
Indicates that a signal is being received.
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