Hi I'm only new and I am struggling at some points to understand what everything means could you all please help me if you know the meaning of the letters could you please post in comments along with the what it is and the meaning please

Example for comments

CM - Cervical Mucus

Thank you again and I really do appreciate everyone's help so then I'll be able to understand and learn to and so I can join in and maybe some support or help to others as well thank you