What do these codes mean on ultrasounds?

Bethany • 33-year-old mom to a 4-year-old little girl 🩷 baby #2 on the way! 🍼🙏 Praying for a healthy and thriving pregnancy

I'm currently 8 weeks and they just did an ultrasound today and I won't find out my results until next week but I didn't know what the codes are on the left hand side of the ultrasound pictures. You could see it on the second picture