These are the currently confirmed ALT codes that I've managed to test today, 2020/08/24, as they'd appear in the chat. To use them, one needs a keyboard and a numpad:
1. hold alt-key
2. type the number combination
3. release the alt-key
This way, I don't have to use "<3" anymore like a basic bish, and my chats can look a bit more lively and fun to read.
Lemme know if there are other alt-codes that I might've missed! I chose the ones that would be the most beneficial to me, so hispanic/russian letters I sort of omitted.
For anyone who comes across this and want's to copy it into game here you go. Note that it's 3 lines too long for a macro so you will have to swap some out if you want the last couple
♥ Alt+3 ↑ Alt+24 « Alt+174 α Alt+224
♦ Alt+4 ↓ Alt+25 » Alt+175 ß Alt+225
♣ Alt+5 → Alt+26 √ Alt+251 Σ Alt+228
♠ Alt+6 ← Alt+27 ± Alt+241 σ Alt+229
○ Alt+9 ▼ Alt+31 ≤ Alt+243 π Alt+227