該 means “the said, applicable”

がい · gai

Also: above-stated, that specific

On'yomi (Chinese reading)
ガイ

JLPT N1 · Taught in secondary school · 13 strokes

The story

Words (言) beside 亥, the last sign of the zodiac: picture a list read to the very end until the right entry turns up. 該当 is "applies", the box you tick on forms, 該当なし is "no results", and news says 当該車両 for "the vehicle in question".

Used in 該当 (gaitou, applicable/matching), 当該 (tougai, the said/in question), and 該当者 (gaitousha, person concerned)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.