Technoline WS 9218 Manuel D'instructions page 18

New moon
Air pressure and weather forecast

Air pressure range: 800-1100Hpa

Air pressure trend displayed in arrow symbols (same as temperature
trend and will be used for weather forecast of station.)

4 symbols for weather forecast as follows:
Sunny
Slightly cloudy
Cloudy
Waxing crescent First quarter
EN7
Waxing gibbous