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Hello!
The shield after a someone's nickname with a number represents his / her tank's percentage protection against your equipped turret.

that does not make any sense
and i have protection module M1 but i didn't get any of those shielded-nmbrs.....
please give some correct answers.

You won't be able to see the shield but others can as it's found beside your nickname which is hovering above your tank.
Customer support service by UserEcho
Hello!
The shield after a someone's nickname with a number represents his / her tank's percentage protection against your equipped turret.