I know that to use them you have to import 'package:flutter/cupertino.dart';
and use it like this Icon(CupertinoIcons.info);
but it's hard to pick needed icon.
Dear Flutter team, please make complete Cupertino icons reference somewhere. One place has names without icons and other has icons without names.
UPDATE:
As Mariano noted and as shown in this answer name mapping is not yet complete and we can use icons as follows:
const IconData baseball = const IconData(0xf3dd,
fontFamily: CupertinoIcons.iconFont,
fontPackage: CupertinoIcons.iconFontPackage);
Icon(baseball);
Where 0xf3dd is a code of an icon (f3dd) which you can find here.