In shipping, the designation A1 is a symbol used to denote quality of construction and material. In the various shipping registers ships are classed and given a rating after an official examination, and assigned a classification mark, which appears in addition to other particulars in those shipping registers after the name of the ship.
- Chisholm, Hugh, ed. (1911). Encyclopædia Britannica. 1 (11th ed.). Cambridge University Press. p. 2..
- An example of a shipping registry including A1-rated ships (those listed "1" in the "Rate A." column)
- American Bureau of Shipping Notations and Symbols – 29 January 2015