How to represent [RETURN] key in MS Word

i think you're looking for the downwards arrow with corner leftwards?

↵

• "carriage return arrow"
• U+21B5
• ↵
• ↵
• Alt + 21B5

I would recommend getting a keycap font (one example I quickly found is Qwerty PC), especially if you'll be representing keystrokes often throughout your documents. Make sure the font covers special keys like Enter ↵. Some are free, and some aren't.

If you go this route, however, consider whether you'll need to embed the font so you can open the file on another computer.

I generally use <ENTER> for my technical documentation, with a space after the last command. Then in the intro of the document you can say what it represents, and that the preceding space is just for formatting and should be ignored.