@higgins you can use #dotnet / #csharp on almost anything.
Anything from apps running in the cloud to servers, desktops, mobile devices and even small chips.
In other words anything with a CPU, SoC or MCU.
You can use dotnet csharp on #esp32 and #stm32 with #nanoFramework
And so on... Even way back somewhere at the beginning there was .NET micro framework so you could write c# code to run on MCU's like STM32 and others.
These days I target Android using #godot and csharp.