Code that can be run on metalsmith.io to dump the symbolset icons at the bottom of the page, with title-text indicating what `icon` value to use for each one in `plugins.json`.

metalsmith-symbolset.js

[
	'ss-cursor',
	'ss-crosshair',
	'ss-search',
	'ss-zoomin',
	'ss-zoomout',
	'ss-view',
	'ss-attach',
	'ss-link',
	'ss-unlink',
	'ss-move',
	'ss-write',
	'ss-writingdisabled',
	'ss-erase',
	'ss-compose',
	'ss-lock',
	'ss-unlock',
	'ss-key',
	'ss-backspace',
	'ss-ban',
	'ss-smoking',
	'ss-nosmoking',
	'ss-trash',
	'ss-target',
	'ss-tag',
	'ss-bookmark',
	'ss-flag',
	'ss-like',
	'ss-dislike',
	'ss-heart',
	'ss-star',
	'ss-sample',
	'ss-crop',
	'ss-layers',
	'ss-layergroup',
	'ss-pen',
	'ss-bezier',
	'ss-pixels',
	'ss-phone',
	'ss-phonedisabled',
	'ss-touchtonephone',
	'ss-mail',
	'ss-inbox',
	'ss-outbox',
	'ss-chat',
	'ss-user',
	'ss-users',
	'ss-usergroup',
	'ss-businessuser',
	'ss-man',
	'ss-male',
	'ss-woman',
	'ss-female',
	'ss-raisedhand',
	'ss-hand',
	'ss-pointup',
	'ss-pointupright',
	'ss-pointright',
	'ss-pointdownright',
	'ss-pointdown',
	'ss-pointdownleft',
	'ss-pointleft',
	'ss-pointupleft',
	'ss-cart',
	'ss-creditcard',
	'ss-calculator',
	'ss-barchart',
	'ss-piechart',
	'ss-box',
	'ss-home',
	'ss-globe',
	'ss-navigate',
	'ss-compass',
	'ss-signpost',
	'ss-location',
	'ss-floppydisk',
	'ss-database',
	'ss-hdd',
	'ss-microchip',
	'ss-music',
	'ss-headphones',
	'ss-discdrive',
	'ss-volume',
	'ss-lowvolume',
	'ss-mediumvolume',
	'ss-highvolume',
	'ss-airplay',
	'ss-camera',
	'ss-picture',
	'ss-video',
	'ss-webcam',
	'ss-film',
	'ss-playvideo',
	'ss-videogame',
	'ss-play',
	'ss-pause',
	'ss-stop',
	'ss-record',
	'ss-rewind',
	'ss-fastforward',
	'ss-skipback',
	'ss-skipforward',
	'ss-eject',
	'ss-repeat',
	'ss-replay',
	'ss-shuffle',
	'ss-index',
	'ss-storagebox',
	'ss-book',
	'ss-notebook',
	'ss-newspaper',
	'ss-gridlines',
	'ss-rows',
	'ss-columns',
	'ss-thumbnails',
	'ss-mouse',
	'ss-usb',
	'ss-desktop',
	'ss-laptop',
	'ss-tablet',
	'ss-smartphone',
	'ss-cell',
	'ss-battery',
	'ss-highbattery',
	'ss-mediumbattery',
	'ss-lowbattery',
	'ss-chargingbattery',
	'ss-lightbulb',
	'ss-washer',
	'ss-downloadcloud',
	'ss-download',
	'ss-downloadbox',
	'ss-uploadcloud',
	'ss-upload',
	'ss-uploadbox',
	'ss-fork',
	'ss-merge',
	'ss-refresh',
	'ss-sync',
	'ss-loading',
	'ss-file',
	'ss-files',
	'ss-addfile',
	'ss-removefile',
	'ss-checkfile',
	'ss-deletefile',
	'ss-exe',
	'ss-zip',
	'ss-doc',
	'ss-pdf',
	'ss-jpg',
	'ss-png',
	'ss-mpthree',
	'ss-rar',
	'ss-gif',
	'ss-folder',
	'ss-openfolder',
	'ss-downloadfolder',
	'ss-uploadfolder',
	'ss-quote',
	'ss-unquote',
	'ss-print',
	'ss-copier',
	'ss-fax',
	'ss-scanner',
	'ss-printregistration',
	'ss-shredder',
	'ss-expand',
	'ss-contract',
	'ss-help',
	'ss-info',
	'ss-alert',
	'ss-caution',
	'ss-logout',
	'ss-login',
	'ss-scaleup',
	'ss-scaledown',
	'ss-plus',
	'ss-hyphen',
	'ss-check',
	'ss-delete',
	'ss-notifications',
	'ss-notificationsdisabled',
	'ss-clock',
	'ss-stopwatch',
	'ss-alarmclock',
	'ss-egg',
	'ss-eggs',
	'ss-cheese',
	'ss-chickenleg',
	'ss-pizzapie',
	'ss-pizza',
	'ss-cheesepizza',
	'ss-frenchfries',
	'ss-apple',
	'ss-carrot',
	'ss-broccoli',
	'ss-cucumber',
	'ss-orange',
	'ss-lemon',
	'ss-onion',
	'ss-bellpepper',
	'ss-peas',
	'ss-grapes',
	'ss-strawberry',
	'ss-bread',
	'ss-mug',
	'ss-mugs',
	'ss-espresso',
	'ss-macchiato',
	'ss-cappucino',
	'ss-latte',
	'ss-icedcoffee',
	'ss-coffeebean',
	'ss-coffeemilk',
	'ss-coffeefoam',
	'ss-coffeesugar',
	'ss-sugarpackets',
	'ss-capsule',
	'ss-capsulerecycling',
	'ss-insertcapsule',
	'ss-tea',
	'ss-teabag',
	'ss-jug',
	'ss-pitcher',
	'ss-kettle',
	'ss-wineglass',
	'ss-sugar',
	'ss-oven',
	'ss-stove',
	'ss-vent',
	'ss-exhaust',
	'ss-steam',
	'ss-dishwasher',
	'ss-toaster',
	'ss-microwave',
	'ss-electrickettle',
	'ss-refrigerator',
	'ss-freezer',
	'ss-utensils',
	'ss-cookingutensils',
	'ss-whisk',
	'ss-pizzacutter',
	'ss-measuringcup',
	'ss-colander',
	'ss-eggtimer',
	'ss-platter',
	'ss-plates',
	'ss-steamplate',
	'ss-cups',
	'ss-steamglass',
	'ss-pot',
	'ss-steampot',
	'ss-chef',
	'ss-weathervane',
	'ss-thermometer',
	'ss-thermometerup',
	'ss-thermometerdown',
	'ss-droplet',
	'ss-sunrise',
	'ss-sunset',
	'ss-sun',
	'ss-cloud',
	'ss-clouds',
	'ss-partlycloudy',
	'ss-rain',
	'ss-rainheavy',
	'ss-lightning',
	'ss-thunderstorm',
	'ss-umbrella',
	'ss-rainumbrella',
	'ss-rainbow',
	'ss-rainbowclouds',
	'ss-fog',
	'ss-wind',
	'ss-tornado',
	'ss-snowflake',
	'ss-snowcrystal',
	'ss-lightsnow',
	'ss-snow',
	'ss-heavysnow',
	'ss-hail',
	'ss-crescentmoon',
	'ss-waxingcrescentmoon',
	'ss-firstquartermoon',
	'ss-waxinggibbousmoon',
	'ss-waninggibbousmoon',
	'ss-lastquartermoon',
	'ss-waningcrescentmoon',
	'ss-fan',
	'ss-bike',
	'ss-wheelchair',
	'ss-briefcase',
	'ss-hanger',
	'ss-comb',
	'ss-medicalcross',
	'ss-up',
	'ss-upright',
	'ss-right',
	'ss-downright',
	'ss-down',
	'ss-downleft',
	'ss-left',
	'ss-upleft',
	'ss-navigateup',
	'ss-navigateright',
	'ss-navigatedown',
	'ss-navigateleft',
	'ss-retweet',
	'ss-share'
].forEach(function(cls) {
	var element = document.createElement('span');
	element.className = 'Plugin-icon ' + cls;
	element.title = cls.slice(3);
	document.body.appendChild(element);
	document.body.appendChild(document.createTextNode(' '));
});