Like the Ark no longer a very current symbol in “craft” / “symbolic” / “blue” degrees, but it can stil be found on tracing boards sometimes. It also appears in some additional degrees, such as the Ark Mariners. Usually signifies “hope”.
The Anchor And Ark
Are emblems of a well-grounded hope and a well-spent life. They are emblematical of that divine Ark which safely wafts us over this tempestuous sea of troubles, and that Anchor which shall safely moor us in a peaceful harbor, where the wicked cease from troubling, and the weary shall find rest.
Ahiman Rezon. Rituals of Freemasonry by Daniel Sickels (1870)
Duncan’s Masonic Ritual and Monitor (1866) by Malcolm C. Duncan