traditional: 氣
simplified: 气
Pinyin: qi [4th sound]
Definition: gas, air, smell, weather, vital breath

The original word were three horizontal line, shows the picture of weather (cloudiness). After, to make this word different from “三 (three)”, so we added whip line at the upper and lower part. The traditional character wrote “氣”, it come from “餼” (饩, xi4) originally.