7 icons for "underground"

square-m

train-front

train-front-tunnel

tram-front

building-tunnel

subway

subway-fill

The best open-source icons in one place

All under MIT or ISC license - free for your personal and commercial projects.

Phosphor

1,512 icons MIT

Simple Icons

3,397 icons CC0 1.0

Lucide

1,668 icons ISC

Phosphor Filled

1,512 icons MIT

Feather

Heroicons

Tabler

4,985 icons MIT

Meteocons