You are invited to request new icons which may be created and included in next mapskin public release.
Open an issue on Github to do so, and please follow the steps bellow:
ms-prefix for the icon name.
Find a bug in mapskin ?
Anything wrong with an icon shape, name or CSS ?
Please let us know by opening an issue on Github as described bellow:
Contact firstname.lastname@example.org for any inquiry.