diff --git a/stdlib/_typeshed/__init__.pyi b/stdlib/_typeshed/__init__.pyi
index 89ca9d816..c50fe4861 100644
--- a/stdlib/_typeshed/__init__.pyi
+++ b/stdlib/_typeshed/__init__.pyi
@@ -115,16 +115,16 @@ class SupportsItems(Protocol[_KT_co, _VT_co]):
 # stable
 class SupportsKeysAndGetItem(Protocol[_KT, _VT_co]):
     def keys(self) -> Iterable[_KT]: ...
-    def __getitem__(self, __k: _KT) -> _VT_co: ...
+    def __getitem__(self, __key: _KT) -> _VT_co: ...
 
 # stable
 class SupportsGetItem(Container[_KT_contra], Protocol[_KT_contra, _VT_co]):
-    def __getitem__(self, __k: _KT_contra) -> _VT_co: ...
+    def __getitem__(self, __key: _KT_contra) -> _VT_co: ...
 
 # stable
 class SupportsItemAccess(SupportsGetItem[_KT_contra, _VT], Protocol[_KT_contra, _VT]):
-    def __setitem__(self, __k: _KT_contra, __v: _VT) -> None: ...
-    def __delitem__(self, __v: _KT_contra) -> None: ...
+    def __setitem__(self, __key: _KT_contra, __value: _VT) -> None: ...
+    def __delitem__(self, __key: _KT_contra) -> None: ...
 
 StrPath: TypeAlias = str | PathLike[str]  # stable
 BytesPath: TypeAlias = bytes | PathLike[bytes]  # stable
diff --git a/stdlib/builtins.pyi b/stdlib/builtins.pyi
index 8e092b6fa..a312b4da1 100644
--- a/stdlib/builtins.pyi
+++ b/stdlib/builtins.pyi
@@ -1059,9 +1059,9 @@ class dict(MutableMapping[_KT, _VT], Generic[_KT, _VT]):
     @overload
     def pop(self, __key: _KT, __default: _VT | _T) -> _VT | _T: ...
     def __len__(self) -> int: ...
-    def __getitem__(self, __k: _KT) -> _VT: ...
-    def __setitem__(self, __k: _KT, __v: _VT) -> None: ...
-    def __delitem__(self, __v: _KT) -> None: ...
+    def __getitem__(self, __key: _KT) -> _VT: ...
+    def __setitem__(self, __key: _KT, __value: _VT) -> None: ...
+    def __delitem__(self, __key: _KT) -> None: ...
     def __iter__(self) -> Iterator[_KT]: ...
     if sys.version_info >= (3, 8):
         def __reversed__(self) -> Iterator[_KT]: ...
diff --git a/stdlib/multiprocessing/managers.pyi b/stdlib/multiprocessing/managers.pyi
index d953785d8..190b4ca12 100644
--- a/stdlib/multiprocessing/managers.pyi
+++ b/stdlib/multiprocessing/managers.pyi
@@ -68,9 +68,9 @@ class ValueProxy(BaseProxy, Generic[_T]):
 class DictProxy(BaseProxy, MutableMapping[_KT, _VT]):
     __builtins__: ClassVar[dict[str, Any]]
     def __len__(self) -> int: ...
-    def __getitem__(self, __k: _KT) -> _VT: ...
-    def __setitem__(self, __k: _KT, __v: _VT) -> None: ...
-    def __delitem__(self, __v: _KT) -> None: ...
+    def __getitem__(self, __key: _KT) -> _VT: ...
+    def __setitem__(self, __key: _KT, __value: _VT) -> None: ...
+    def __delitem__(self, __key: _KT) -> None: ...
     def __iter__(self) -> Iterator[_KT]: ...
     def copy(self) -> dict[_KT, _VT]: ...
     @overload
diff --git a/stdlib/types.pyi b/stdlib/types.pyi
index 964f0b621..16fe096d3 100644
--- a/stdlib/types.pyi
+++ b/stdlib/types.pyi
@@ -304,7 +304,7 @@ class CodeType:
 class MappingProxyType(Mapping[_KT, _VT_co], Generic[_KT, _VT_co]):
     __hash__: ClassVar[None]  # type: ignore[assignment]
     def __init__(self, mapping: SupportsKeysAndGetItem[_KT, _VT_co]) -> None: ...
-    def __getitem__(self, __k: _KT) -> _VT_co: ...
+    def __getitem__(self, __key: _KT) -> _VT_co: ...
     def __iter__(self) -> Iterator[_KT]: ...
     def __len__(self) -> int: ...
     def copy(self) -> dict[_KT, _VT_co]: ...
diff --git a/stdlib/typing.pyi b/stdlib/typing.pyi
index a8a7d4f08..81ba34104 100644
--- a/stdlib/typing.pyi
+++ b/stdlib/typing.pyi
@@ -576,7 +576,7 @@ class Mapping(Collection[_KT], Generic[_KT, _VT_co]):
     # TODO: We wish the key type could also be covariant, but that doesn't work,
     # see discussion in https://github.com/python/typing/pull/273.
     @abstractmethod
-    def __getitem__(self, __k: _KT) -> _VT_co: ...
+    def __getitem__(self, __key: _KT) -> _VT_co: ...
     # Mixin methods
     @overload
     def get(self, __key: _KT) -> _VT_co | None: ...
@@ -589,9 +589,9 @@ class Mapping(Collection[_KT], Generic[_KT, _VT_co]):
 
 class MutableMapping(Mapping[_KT, _VT], Generic[_KT, _VT]):
     @abstractmethod
-    def __setitem__(self, __k: _KT, __v: _VT) -> None: ...
+    def __setitem__(self, __key: _KT, __value: _VT) -> None: ...
     @abstractmethod
-    def __delitem__(self, __v: _KT) -> None: ...
+    def __delitem__(self, __key: _KT) -> None: ...
     def clear(self) -> None: ...
     @overload
     def pop(self, __key: _KT) -> _VT: ...