• 信しんじる — to believe
• 自信じしん — confidence
• 通信つうしん — communication
• 信用しんよう — trust, credit
• 信号しんごう — traffic signal
• 確信かくしん — conviction, firm belief

信 is made of the person radical 亻 and 言 (words/speech). Together they show a person who speaks truth — the basis of “trust” and “belief.” This kanji frequently appears in emotional and communication-related contexts.

彼かれを 信しんじてください。
Please believe in him.

私わたしは 自信じしんがあります。
I have confidence in myself.

🎧 The on-yomi “シン” appears in compound words like 信用 and 自信. The kun-yomi “しんじる” is very commonly used in personal contexts, meaning to believe in something or someone.