The finger pointing upward, indicates the soul traveling to Heaven, sometimes a presumptuous claim, though a hopeful one. The finger pointing upwards can be coupled with other symbols:

• a willow tree, a traditional symbol of sorrow indicating while the soul of their loved one has gone to Heaven, the family on Earth mourns the loss and grieves for their loved one
• the crown symbolizing victory. Sometimes the combination of the images represent the flight of the soul from the earthly realm to the Heavenly realm

In this case, the finger pointing upward is pointing to an open book, most likely respresenting the Holy Bible.  On this gravestone, the finger suggests that the Word is the pathway to Heaven.  The finger pointing upward and the open Bible is enveloped in a heart suggesting love for the departed woman.

River View Cemetery, Seattle, Washington