Are you supposed to use an arrow → or not.
Where 'P' is the piece being moved (Pawn) , 'Q' is promotion to (Queen), 'e8' is the file ('e') and rank ('8')?
According to Wikipedia's Pawn Promotion page,
According to the World Chess Federation (FIDE) handbook,
Also in the same section, it is not necessary to denote the piece that is being moved if it is a Pawn.
Note: Standard algebraic notation (SAN) is the official notation of the FIDE which must be used in all recognized international competition involving human players. Concerning computer chess, SAN is a representation standard for chess moves inside the Portable Game Notation standard using the ASCII Latin alphabet, and should be supported as default notation by all modern chess programs and their user interfaces.
It is also quite possible that the OP was wondering about the use of → (arrow) or not with Figurine Algebraic Notation (FAN). Unfortunately, U+2654 or ♔ and other chess glyphs do not always appear as they should . This is most likely due to the default fonts used in most browsers.
FIDE is not the arbiter of chess-notation. By far the most common way to express promotion using algebraic notation is
[Edit] By request, I did a small sampling of the literature I have available.
Of the 22 chess books I own, 14 use algebraic while 8 use descriptive (primarily because they are older books). Of the 14 algebraic:
So it looks as those