The first paragraph of the reference letter template explains your connection to the person you are recommending, including how you know them, and why you are qualified to write a reference letter to recommend employment or graduate school. Paragraph 2.
A Transitional Doctor of Physical Therapy Degree is also offered for those who already hold a professional Bachelors or Master of Physical Therapy (PT or MPT) degree. As of 2015, all accredited and developing physical therapist programs are DPT programs.
RPT is a now archaic description, standing for registered physical therapist.. The term was widely used prior to the 1990's when all physical therapists graduated with either a Bachelor's Degree or an equivalent Certificate of Completion (usually 18 months of study for someone who already had a Bachelor's Degree in another field of study).