B737 Approach Ref page T symbol next to ILS FREQ
Hi.
I found something curious thing on approach ref page.
Normally, you can see ILS FREQ / CRS on L4, APPROACH REF PAGE.
but I found T symbol next to CRS.
According to FCOM, It says
"Displays front course, if an ILS, localizer, or localizer back course is displayed on 4L. If the course is true displays is suffixed with 'T'."
I can't understand why it is displayed.
Plz give me detailed information.