OK,
I'll see if I can get you there.
1. Open windows character map and set the Character Set box to 'Unicode' and the Group by box to 'All'.
2.Scoll down a little past half way to find the 'small capital gamma sign (
ᴦ),(don't confuse it with the Cryllic small Ghe which is only about a third the way down), then click on the gamma symbol, select it and it appears in the Characters to Copy box.
3. Scroll down to almost the bottom to find the 2206 increment symbol (∆),(it looks just like the delta)

select it, add it to the Characters to Copy box.
4. I also put the rest of the Greek characters that aren't like Roman letters in the Characters to Copy box (ᴦ∆ΘΛΞΠΣΦΨΩ). You can highlight them individually and copy from there to paste then into your post.
5. I pinned the windows character map to my task bar and left the Greek characters in the Copy box so it's easy to bring up when needed.
Note: You can also drag either the small gamma or the Delta/increments symbols into the post from where they are, but they are a little hard to find, but not bad once you know where they are.
Let me know if you get it from what I explained.
∆oucet