“6th” (sixth) means:

• The ordinal form of 6, showing position in a sequence.
  • Example: She finished 6th in the race = she came in position number six.
• It can also refer to:
  • The 6th day of a month (e.g., July 6th)
  • The sixth item, rank, or place in an ordered list

In short, it means number six in order or rank.