A shield (heraldry) is the principal portion of a heraldic achievement or coat of arms. Figures and patterns are depicted emblazoned upon the shield in many arrangements.
A shield (science fiction) is a fictional device that use energy fields to protect a person or spacecraft.
A shield (Star Trek) is an energy device used in Star Trek to protect spacecraft.
A tunnelling shield is a protective structure used in the excavation of tunnels through soil that is too soft or fluid to remain stable during the time it takes to line the tunnel with a support structure of concrete or steel.
SHIELD. is the Supreme Higher Intelligence Enforcement of Law Division in the Marvel Comics universe. It is an international intelligence agency headed by a director named Nick Fury.
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