Franklin's version of the song contains the famous lines (as printed in the lyrics included in the 1985 compilation album Atlantic Soul Classics):
R-E-S-P-E-C-T
Find out what it means to me
R-E-S-P-E-C-T
Take care ... TCB
The last line is often misquoted as "Take out, TCP", or something similar, and indeed most published music sheets which include the lyrics have this incorrect line in them. "R-E-S-P-E-C-T" and "T-C-B" are not present in Redding's original song, but were included in some of his later performances with the Bar-Kays.
"TCB" is an abbreviation that was commonly used in the 1960s and 1970s, meaning "Taking Care of Business", and it was particularly widely used in African-American culture. However, it was somewhat less well-known outside of that culture, yielding a possible explanation as to why it was not recognized by those who transcribed Franklin's words for music sheets.