Network topology (ASCII)
Internet → firewall → switch → three application servers. The kind of diagram you'd otherwise hand-draw in a PR description.
Rendering…
Make it your own.
+----------+
| Internet |
+----+-----+
|
+----v-----+
| Firewall |
+----+-----+
|
+----v-----+
| Switch |
+-+--+--+-++
| | | |
+---+ | | +---+
| | | |
+---v--+ +-v--+--+ +-v-----+
| web1 | | web2 | | web3 |
+------+ +-------+ +-------+