hass-icons.txt

hass:account
hass:alert
hass:alert-circle
hass:altimeter
hass:apple-safari
hass:apps
hass:arrow-bottom-left
hass:arrow-down
hass:arrow-left
hass:arrow-right
hass:arrow-top-right
hass:arrow-up
hass:autorenew
hass:battery
hass:battery-
hass:battery-alert
hass:battery-outline
hass:battery-unknown
hass:bell
hass:bell-outline
hass:bell-plus
hass:bell-ring
hass:bell-sleep
hass:bookmark
hass:brightness-
hass:broom
hass:calendar
hass:calendar-clock
hass:cast
hass:cast-connected
hass:chart-line
hass:checkbox-marked-circle
hass:chevron-down
hass:chevron-left
hass:chevron-right
hass:chevron-up
hass:clock
hass:clock-fast
hass:close
hass:cloud-upload
hass:code-tags
hass:comment-alert
hass:content-save
hass:crop-portrait
hass:cursor-pointer
hass:delete
hass:door-closed
hass:door-open
hass:dots-vertical
hass:drawing
hass:emoticon
hass:emoticon-dead
hass:emoticon-poop
hass:exit-to-app
hass:eye
hass:eye-off
hass:fan
hass:file-document
hass:file-word-box
hass:file-xml
hass:fire
hass:flash
hass:flash-off
hass:flower
hass:format-list-bulleted
hass:garage
hass:garage-open
hass:gauge
hass:google-circles-communities
hass:google-pages
hass:help-circle
hass:home
hass:home-assistant
hass:home-automation
hass:home-map-marker
hass:home-outline
hass:home-variant
hass:image-filter-center-focus
hass:image-filter-frames
hass:information-outline
hass:leaf
hass:lightbulb
hass:link
hass:lock
hass:lock-open
hass:login-variant
hass:mailbox
hass:map-marker
hass:menu
hass:menu-down
hass:menu-up
hass:microphone
hass:music-note
hass:music-note-off
hass:nature
hass:notification-clear-all
hass:open-in-new
hass:pause
hass:pencil
hass:play
hass:play-pause
hass:playlist-play
hass:plus
hass:poll-box
hass:power
hass:power-plug
hass:power-plug-off
hass:power-sleep
hass:radio-tower
hass:radiobox-blank
hass:ray-vertex
hass:refresh
hass:remote
hass:robot-vacuum
hass:rotate-left
hass:rotate-right
hass:run
hass:security
hass:send
hass:server-network
hass:server-network-off
hass:settings
hass:shield-check
hass:shield-home
hass:shield-lock
hass:shield-outline
hass:skip-next
hass:skip-previous
hass:sleep
hass:snowflake
hass:square
hass:square-outline
hass:stop
hass:text-to-speech
hass:textbox
hass:thermometer
hass:thermostat
hass:timer
hass:timer-off
hass:timer-sand
hass:tooltip-account
hass:vibrate
hass:video
hass:volume-high
hass:volume-medium
hass:volume-off
hass:walk
hass:water
hass:water-off
hass:water-percent
hass:weather-cloudy
hass:weather-fog
hass:weather-hail
hass:weather-lightning
hass:weather-lightning-rainy
hass:weather-night
hass:weather-partlycloudy
hass:weather-pouring
hass:weather-rainy
hass:weather-snowy
hass:weather-snowy-rainy
hass:weather-sunny
hass:weather-windy
hass:weather-windy-variant
hass:white-balance-sunny
hass:window-closed
hass:window-open
hass:z-wave

hass:monitor
hass:tablet

At time of writing, the MDI website is not showing a rendered 'cheatsheet', instead showing the raw HTML. Using a tool on GitHub called htmlpreview, we can load it:

https://htmlpreview.github.io/?https://cdn.jsdelivr.net/npm/@mdi/font/preview.html

Current version is 5.9.55, which seems to be the version in use by HASS.