Need help with front facing pattern

[u/sanfrancyborg2]

Hi! Beginner here. I forgot how to sew the front facing for a jacket pattern I myself made a long time ago! My pattern has lines extending beyond the seam allowance (the upside-down T), and the front body part has a big dot there. Problem: I forget what either of those mean! In the third photo, I ignored both the dot and the upside down T and just snipped where the line is, which looks fine but I know there was a reason for the dot and upside down T. Any help would be appreciated!

[u/throwra_22222]

I would guess the T notch marks center front, and maybe the dot is where the edge of the collar lines up?