YCT: 

Same as YC, except includes thermocouple inside the head to measure total temperature.
Standard diameters are 5/32", 3/16", 1/4", 3/8"

W: 

Three-hole, wedge shaped measuring
section.  Measures total and static pressure and yaw angle.  Insensitive to pitch angle up to 30°.  Furnished with individual calibration curves.  Typical calibration shown in Fig. 4. Tip extends 1 diameter beyond hole.  Usable up to Mach 0.7.
Standard diameters are 3/16", 1/4", 3/8"

WT:

Same as W, also includes thermocouple inside the head to measure total temperature with separate inlet and outlet holes.
Standard diameters are 3/16", 1/4", 3/8"

YC:   

Three-hole, prism shaped measuring section. Measures total and static pressure and yaw angle.  Insensitive to pitch angle up to 20°. Furnished with individual calibration curve. Usable up to Mach 0.7.  Tip extends 2 diameters beyond holes. Standard diameters are 1/8", 5/32", 3/16", 1/4", 3/8"

YA:

Three-hole, cylindrical.  For use where only total pressure and yaw angle are to be measured.  Not suitable for static pressure or pitch angles over 5°.  Usable up to Mach 0.7. Tip extends 2 diameters beyond holes. Standard diameters are 1/8", 3/16", 1/4", 3/8"

CA:  

Three tubes.  For use where only total pressure and yaw angle measurement are to be measured.  Usable up to Mach 0.7.  Not suitable for static pressure or pitch angles over 5°.  More accurate for boundary layer traverses than type YA. Standard diameters are 1/8", 5/32", 3/16", 1/4", 3/8"

CT:

Three tubes like CA, plus thermocouple to give total temperature, yaw angle, and total pressure.  Same application as type CA.
Standard diameters are 5/32", 3/16", 1/4", 3/8"