I've though back at all the IOIs I'm familiar with, and I've divided them into categories because those signals are an important screening tool.

First off, what the community refers to as Indicators of Interest I prefer to call Indicators of Attraction, because those little body movements and facial expressions are instinctive reactions rather than deliberate gestures, and they are triggered by attraction rather than interest (Approach Invitations cover the "interest" part). I've burned my fingers enough times with those "false positives" to be fully sure of this conclusion on mine...

Different types of girls are going to react differently when they are attracted to you, and this is completely linked to their personality.

The cutest of all are the Sweet Girls. They are feminine, down-to-earth, possibly a bit shy, and they display the typical signs like smiling while looking down, fixing hair, and much much more than that (some signals are very subtle):

Indicators of Attraction

Then we have the Divas, characterised by their presumptuousness and their over-compensating aloofness, who maintain that desire of wanting to appear as "superior" to you even (and especially) when they are attracted to you:

Diva IOAs

Moving on we have the combative, bossy and arrogant girls (the so-called Evil Bitches), who maintain their aggressiveness even when showing attraction, and it's especially important yo screen them out:

Bitchy IOAs

Finally, a minority of girls will show active disinterest, since they smell from the distance that you are "dangerous" by their standards, and they give you the hint to stay away. The good thing is that you don't have to just take that negative signal and move on, you can actually dismiss them from the distance first, and then move on:

IODs

Wrapping up: getting IOAs is nice and can make you feel good, the day if surely pleasant if you manage to secure a constant stream of IOAs after working hard on your Fundamentals. But no matter how attracted a girl can be, she is never going to stop you in the middle of the high street and start escalating things with you. That's on you.

Cheers