し
や
None
The arrow radical and the arrow kanji are the same. Sort of a "straight" shot to memorizing this kanji, you know?
To remember the reading や we use the word “Yankees” (like the evil baseball team, go M’s!).
What is this arrow doing? It’s following around all the Yankee (や) baseball players, stalking them, waiting to make its move (I’ll let you decide what its “move” is).