Comment by aragonite

This. Although the most ergonomic compose key sequences tend to be assigned to accented characters rather than symbols, so IMO not very convenient for programming.

On Windows I use Capslock (and/or the right Shift key) as a custom-defined modifier to combine with character keys to enter my most frequently used unicode characters for programming personal projects.

Lots of fun characters available for use even when you're dealing with a language where identifiers are limited to ID_Start and ID_Continue (e.g. Javascript), for example:

  ⴵ ⵛ ꘜ ⵣ ꕤ ꖜ 
  ꘖ ꧮ ⴲ ꘖ Ⰴ Ⰺ