A process in which heat can flow from system to surroundings or vice-versa is called `"…......................"` process.

Explanation

To answer the question regarding the type of thermodynamic process in which heat can flow from the system to the surroundings or vice versa, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Heat Transfer**: The question specifies a process where heat can flow in both directions: from the system to the surroundings and from the surroundings to the system.

2. **Identifying the Process Type**: In thermodynamics, processes are classified based on how they exchange energy with their surroundings. The two primary classifications are:
- **Isolated Process**: No heat exchange occurs.
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