The televison film "Remembering Leonard Nimoy" appeared recently on the local Public Broadcasting System (PBS) channel. The film is a 2017 documentary produced by Health Point Productions and Leonard's daughter Julie Nimoy about the actor who gained fame by playing "Mr. Spock" on the 1960's television series "Star Trek". At the end of the film Leonard Nimoy's gravesite appears and the marker has some United States coins on it, mostly quarters. One of the quarters is a 1976 Bicentennial quarter. Leonard Nimoy's grave with coins The film offered no explanation for the presence of the coins.
Dang I read a piece on this a while back. When I went to Arlington there were a number of graves with coins on them and as I recall the different denominations have a specific meaning but I cannot remember what that was. But I think it is primarily so the family will know the grave had been visited by caring folks.
As @Randy Abercrombie wrote, the coins are indeed loose coins placed by visitors to his grave. In some customs leaving a coin on a headstone is a sign to grieving family members that someone visited there to pay their respects. In Jewish tradition (Nimoy’s heritage) visitors place small stones/pebbles on top of a marker as an honor to the deceased. In the picture below you can see a wider view of the grave marker, with several stones/pebbles above it. (You can also see in the picture that the coins are different than in the O.P. picture). Also, Nimoy served in the Army, and a USA military tradition some observe is to leave specific coin denominations to represent different connections. Penny = Paying respect to the deceased’s military service. Nickel = The visitor trained with or went through boot camp with the deceased. Dime = The visitor at some point served alongside the deceased. Quarter = The visitor had a close relationship with the deceased and visited them on their deathbed. (Nimoy was very sick for a very long time.) This article speaks in general terms about the tradition: https://www.army.mil/article/229641/fort_sill_air_defenders_place_coins_at_post_cemetery
Well usually (I wont say always) but coins left on veterans graves have meaning. I believe Leonard Nimoy was a veteran - googling shows he was in the army reserves for 18 months. Now this part is from chatgpt - so not sure if this is true or not. Also not saying that this is what is going on with his grave. Meanings of Each Coin Penny: Signifies that a visitor, civilian or veteran, stopped by to pay respects. Nickel: Indicates that the visitor and the deceased trained together at boot camp. Dime: Means that the visitor and the service member served together at some point. Quarter: Denotes that the visitor was physically present with the service member when they died. Did not completely read a post above. Got covered by an ad.