Here are the complete terms for each of the abbreviations:
(i) Ltd. - Limited
Often used in the names of companies to indicate that they are a privately held company with limited liability.
(ii) St. - Street or Saint
If it's used in an address, it stands for "Street". If it refers to a person, it means "Saint."
(iii) AM - Ante Meridiem
Refers to the time period from midnight to noon (12:00 AM to 11:59 AM).
(iv) PM - Post Meridiem
Refers to the time period from noon to midnight (12:00 PM to 11:59 PM).
(vi) Prof. - Professor
A title used before the name of a person with a high academic rank.
(vii) Lt. - Lieutenant
A rank in the military or other uniformed services.
(viii) i.e. - Id est
A Latin phrase meaning 'that is' or 'in other words,' used to clarify.
(ix) e.g. - Exempli gratia
A Latin phrase meaning 'for example,' used to give examples.
(xi) Lit. - Literature
Refers to written works, especially those considered to be of superior or lasting artistic merit.
(xii) f - Usually represents the function in mathematics
Commonly used to symbolize a function, particularly in the standard notation f ( x ) , meaning the function f of x .
(xiii) Jr. - Junior
Used after a man's name to distinguish him from an older member of the family with the same name, typically his father.
(xiv) Sr. - Senior
Used after a man's name to distinguish him from a younger member of the family with the same name, typically his son.
(xv) Approx. - Approximately
Used to show that an amount, number, or time is not exact, but close.