Definition:Arithmetic Sequence/Also known as

Arithmetic Sequence: Also known as
The term arithmetic progression is usual.

Arithmetical progression is also sometimes seen.

Hence the abbreviation A.P. is well-understood.

However, use of the term progression, although ubiquitous in the literature, is deprecated on on account of the fact that the term is used both for arithmetic sequence and arithmetic series, and this can be a source of confusion.