Use I with serif for italic format library icon

This is to distinguish the character from the slash character to avoid
confusion with the slash inserter (especially with the new writing
prompt that says to type "/").

packages/icons/src/library/format-italic.native.js

@@ -0,0 +1,16 @@
+/**
+ * WordPress dependencies
+ */
+import { SVG, Path } from '@wordpress/primitives';
+
+// This is an alternative italic icon provided for the mobile editor to
+// avoid confusion with the slash key. See: https://github.com/wordpress-mobile/WordPress-iOS/pull/16064#issuecomment-821541499
+// TODO: Once we align with core on an italic icon that does not look like a
+// slash, we can remove the native variant
+const formatItalic = (
+	<SVG xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+		<Path d="M16 5H10V6.5H12.0464L10.1136 17.5H8V19H14V17.5H12.0136L13.9464 6.5H16V5Z" />
+	</SVG>
+);
+
+export default formatItalic;