Well let’s see… Here’s a few from this thread:

• Being really into something and struggling to not correct people when they say something wrong about that thing. And when you do correct them, they think you’re being egotistical.
• Being selectively mute
• Having autistic friends
• Having non-typical views about gender and/or sexuality
• Being diagnosed with BPD, bipolar, anxiety, depression, and several other mental health disorders. Especially true for women. This is because doctors tend to suck at identifying autistic people and instead think these other things are what they’re seeing.

There are many other signs also, but this is just some that may be helpful. Bear in mind that someone can have any of those things and not be autistic, but when they have a bunch of them together, they’re probably autistic.

What it means to be autistic. What makes this more fun is how much learning about autism has essentially become a special interest of mine. The amount of responses in this thread that scream unrealized autistic is very high. :D