region
The universal set is represented by a rectangle. Subsets of this set are represented by closed curves (often circles). A ⊂ € Further subsets are represented by a closed curve within a larger closed curve. Q ⊂ P ⊂ € The intersection of two sets (A & B) is the set of elements that are members of both A & B and is usually shown as a shaded region. A ∩ B The union of two sets (A & B) is the set of all elements contained in A & B. A ∪ B.
A union closed shop is a workplace in which only union workers are allowed and to work and an open shop allows non union workers
This question needs to be rewritten. I can think of union terms for "open/closed" shops, but I am not sure this is what you want.
interior
In a closed shop, union membership is required. The employer agrees to hire union members only. The employees must remain members of the union in order to remain employed.
closed shop
there are no western union open we went to almost all manila branches and sm establishment and they are closed
The symbol for union typically used in set theory is ∪, which represents the combination of all elements from two or more sets.
secretary of interior
CUCXCATTVAN
The closed-shop policy, which was outlawed by the Taft-Hartley Act in 1947, forced workers to join the union in order to be hired at a company and to remain a union member in order to continue employment.
Secty of Interior Ken Salezar