Screenshot of icons available in threads.

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   Fedilab Apps (apps@toot.fedilab.app)'s status on Monday, 09-Jan-2023 06:08:51 JST Fedilab Apps

   You are many to ask what that "target/GPS" icon means in threads.
   It simply displays the thread on the remote instance with the public API. So you can see all replies especially the ones not known by your instance.
   If you interact on a reply, Fedilab will do everything in background so your instance will know that reply you are interacting with.