client.send_message(chat, '😉') client.send_message(chat, '\U0001F609')
If you prefer to use text replacements in your code, install the emoji package:
import emoji
client.send_message(chat, emoji.emojize(':wink:'))
References
https://stackoverflow.com/questions/57549311/python-telegram-telethon-how-to-send-emoji
https://pypi.org/project/emoji/
https://apps.timwhitlock.info/emoji/tables/unicode
https://www.webfx.com/tools/emoji-cheat-sheet/