What do these symbols mean in equations

What do these symbols mean in equations

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what does i
What do these symbols mean in equations

A total of 3 guests made comments

2026-01-25

The product feels solid and is easy to maintain.

2026-01-25

Everything fits the description and works as expected.

2026-01-19

The quality is reasonable and the item is easy to use. It meets my expectations and overall I’m pleased with it.

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