Levels of experience in tango, vals or milonga
P - beginners - 6 month to 1 year of experience
S1 – intermediate - 1 to 2 years of experience
S2 – intermediate - 2 to 3 years of experience
S3 – intermediate - 3 to 4 years of experience
Z – advanced – over 4 years of experience
K – followers
W – everyone, no minimum level of experience.