• 参加さんか — participation
• 参拝さんぱい — visiting a shrine
• 参照さんしょう — reference
• 参議院さんぎいん — House of Councillors (Japan)
• 持参じさん — bringing something (with you)
• お参おまいり — pilgrimage, temple visit

The kanji 参 combines a complex older shape representing motion or participation with phonetic elements. It originally suggested "going toward a higher place" and is still used in humble expressions like まいる (to go, to visit) when addressing someone of higher status or visiting sacred sites.

神社じんじゃに 参まいりました。
I visited a shrine.

この会議かいぎに 参加さんかします。
I will participate in this meeting.

The on-yomi サン is common in compound words like 参加 and 参照. The kun-yomi まいる is often used in polite or religious contexts, such as when visiting a shrine or expressing humility.