What do the "S", "T" and "Pr" icons that appear in the "auto-complete window" on the Swift playground mean?

Question

Question

What do the "S", "T" and "Pr" icons that appear in the "auto-complete window" in the Swift Playground mean? Are there other species?

Thank!

Answer (for indexing a search engine)

C  : Classes
Pr : Protocols
f  : Functions
S  : Structs
U  : Unions
E  : Enums
T  : Types
V  : Globals

Answer 1

These are the same abbreviations that appear in the Symbol navigator, where they are defined for you (as shown on the screen from the screen):

So, as the table shows you, C means class, Pr means protocol, etc.