It wasn't a typo, it is the mnemonic (AT=@).

ef2a397a · R David Murray · c05e260e · ef2a397a
Commit ef2a397a authored Apr 01, 2015 by R David Murray
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@@ -147,7 +147,7 @@ PEP 465 - A dedicated infix operator for matrix multiplication
 --------------------------------------------------------------

 This PEP proposes a new binary operator to be used for matrix multiplication,
-called ``@``. (Mnemonic: ``@`` is ``*`` for matrices.)
+called ``@``. (Mnemonic: ``@`` is ``*`` for mATrices.)

 .. seealso::