The device used to secure tall building from the effect of lightening is a metallic called -- conductor.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks for the name of a device that protects tall buildings from lightning strikes.

2. **Identifying the Device**: The device used for this purpose is known as a "lightning rod."

3. **Function of the Lightning Rod**:
- A lightning rod is a metallic conductor that is installed on top of tall buildings.
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