Titleist and Cleveland do not mention 3W, 4W, 5W or 7W on their website. They are marketing lofts: 13, 15, 17, 19 and 22 degrees. Cleveland also sells a 25 degree.
Taylormade, Nike, Mizuno, Cobra, Callaway and Hogan (owned by Callaway) market the terminology:
TM: 3W (13), 4W(16.5), 5W (18), 7W (21), 9W (24)
Nike: 3W+ (13), 3W(15), 4W(17), 5W (19), 7W (21), 9W (23)
Callaway: 3W+ (13), 3W(15), 4W+(17), 5W (19), 7W (21*), 9W (23)
Hogan: 3WS (13), 3W(15), 4W+(17*), 5W (19), 7W (21)
Cobra: 3W+ (13), 3W(15.5), 4W+(16.5), 5W (18), 7W (21), 9W (24)
Mizu: S3W (13.5), 3W(15), 4W(16.5), 5W (18), 7W (21), 9W (23).
Interestingly, Titleist only mentions the 904F on it's website. So, they only have 1 set of "lofts". Taylormade and Nike sell 2 or more sets of FW woods. But, they use the same set of "lofts" for each. But, Mizuno and Cobra have senior and ladies woods with higher lofts than mentioned above. Callaway's Big Bertha wood have different lofts and more options (up to 27*) than the Fusion or X.
So, in summary:
3+: 13*
3 : 13-15.5*
4 : 16.5-17*
5 : 18-19*
7 : 21*
9 : 23-25*





