This is the memorial of the Yamanaka, Nara and Akimichi clan that stands in Konohagakure as a testament of the close-knit relationship between the three clans. Engraved on it are the symbols of the respective clans which commemorates the pact that the three clans made to work together, protect each other and Konoha.
To strengthen their unity further, members of the Sarutobi clan give them earrings that are presented to each generation when they swear their oath. They wear the earrings so that they never forget their oath, as it's there whispering in it into their ear. Children wear the earrings of their parents from the day they become a genin to when they attain the rank of chūnin, so that their parents' oath is burned into their memory. Returning the earrings to their clansmen also symbolise that they are considered adults by their respective clans.
- ↑ Naruto chapter 533, pages 12-17