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Stating the Unicode code points as U+1F4A9 or (D syntax) \U0001F4A9 is a reasonable workaround.

We discourage posts that aren't relevant in some way to D programming.

One of the reasons I enjoy HackerNews is dang's enlightened and sensible moderation policy.

I think OP meant cases like, "I need to process a string with this emoji in D" etc

Would you ever need to talk about a specific emoji?

¯\_(ツ)_/¯