Maki is an icon set made for map designers. Maki includes icons for common points of interest like parks, museums, and places of worship. Each icon is available as an SVG in two sizes: 11px by 11px and 15px by 15px. Maki is open source and CC0 licensed.
https://www.mapbox.com/maki-icons/

https://github.com/mapbox/maki
Mapbox, https://github.com/mapbox/maki/graphs/contributors