Keyframes appear as arrows why is this?

[Sanspoof]

When you say arrow, you mean half of the keyframe is vertical and the other half is normal (half of the original diamond) therefore looking like an arrow?

Well if that’s the case: the arrow keyframe is called a ‘hold’ keyframe. That means instead of smoothly interpolating/animating from one value to the next, the values instantly jump once they hit the hold keyframe in the timeline.

This is a good question to delve deeper into by poking around the adobe online help page to learn about all the different keyframe types… cause they all come in handy.

peace,
Michael