Hands are depicted in many ways on tombstones.
Praying:

Zion Lutheran Cemetery, Schumm, Ohio

Willshire Cemetery
Pointing upward:

Greenbriar Cemetery, Van Wert County, Ohio

Union Cemetery, Darke County, Ohio
Pointing downward:

Hand pointing downward, holding flowers

Riverside Cemetery, Rockford
Clasped hands:

Elm Grove Cemetery, St. Marys, Ohio
Hands crossed:

St. Joseph Cemetery, Wapakoneta
Hands are often shown holding things.
Holding a Bible:

Zion Lutheran Cemetery, Schumm
Holding a cross:

St. Augustine Cemetery, Minster, Ohio
Holding flowers:

Woodland Cemetery, Van Wert
Holding shears:

Woodlawn Cemetery, Ohio City, Ohio
Holding a rope:

Woodlawn Cemetery, Ohio City
This hand probably symbolizes something, but what, I do not know. Maybe someone has an idea.

Riverside Cemetery, Rockford