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AM and PM are abbreviated forms of the Latin words Ante Meridian and Post Meridian respectively. where
AM (Ante Meridian) has English meaning Before Noon and Hindi meaning before noon or in the morning. This time is from 12 o'clock in the night to 12 o'clock in the day. Therefore, the term AM is used over time to indicate the mean time.
PM (Post Meridian) has English meaning After Noon and Hindi meaning after noon or afternoon. This time is from 12 o'clock in the day to 12 o'clock in the night. Therefore, the term PM is used over time to indicate the mean time.
So At noon 12 is PM.