What is the symbol of typhoon wind speed?

According to the notice of National Standard for Tropical Cyclone Grade Implementation (GBT 1920 1-2006) issued by China Meteorological Bureau, tropical cyclones are divided into six grades according to the maximum surface wind force near the center. [5]?

Tropical depression, the maximum wind force is 6 ~ 7, (10.8 ~ 17. 1 m/s);

Tropical storm with maximum wind force of 8-9 (17.2-24.4m/s);

Strong tropical storm with maximum wind force10 ~1,(24.5 ~ 32.6 m/s);

Typhoon, maximum wind force 12 ~ 13, (32.7 ~ 41.4m/s);

Strong typhoon with maximum wind force14 ~15 (41.5 ~ 50.9 m/s);

Super typhoon, maximum wind force ≥ 16 (≥ 5 1.0m/s).