Just my thread:

?- thread_self(Me).
Me = main.

Another thread without alias:

?- thread_create((thread_self(Me),format("~q~n",[Me])),Id,[detached(true)]).
Id = <thread>(3,0x1ac3d20).

<thread>(3,0x1ac3d20)

Another thread with alias:

?- uuid(UUID),thread_create((thread_self(Me),format("~q~n",[Me])),Id,[detached(true),alias(UUID)]).
UUID = Id, Id = '21d3a1e2-ae4f-11eb-a53c-001999a7dee3'.

'21d3a1e2-ae4f-11eb-a53c-001999a7dee3'