Kanji: 下 shita Down
The shorter bar is BELOW the longer bar.
JLPT N5: 42 / 100 | 3 Strokes
On: カ; ゲ
Meaning: below; under; down
This one also has several more readings, but shita is the most useful for now.
靴下 kutsu shita - socks [lit. shoes under]
地下 chi ka - underground, basement
年下 toshi shita - junior, younger, young
kuruma no shita ni neko ga imasu.
There is a cat under the car.