This will be a developing symbols reference as seen on headstones and other funerary monuments.
In general a heavenly being
Angel holding book and pen-Also known as the “Recording Angel”
Angel holding a staff and presenting as male-Father Time
In general represents purity, peace, and grace
A dead dove can represent a new beginning or heartache
In general represents the circle of life
In general represents the beauty of life
A wilted flower is often a symbol of a life cut short.
In Christianity, it represents the Holy Trinity of Faith, Hope, and Charity
Repeating symbols of three can also represent this.
Victory over death
If accompanied with someone who lost their life in battle, it represents their sacrifices will be remembered.