The term ad finem, or its abbreviation ad fin., is used at or near the completion or conclusion of a piece of writing.
The motto Ad finem fidelis was stitched into the family crest which hung above the fireplace in the family room.
When Jane found a very old diary up in the attic, she saw the motto Ad finem spero on the cover and she remembered her grandfather using this expression when she was a toddler visiting him and her grandmother.
Said to be the motto of the Canadian Space Agency.
A motto of perseverance and steadfastness.