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Bells represent the concepts
of peace
and
freedom
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Often used to protect value and impart security.
Locks and keys have existed since as early as 4,000 years ago in Egypt.
It is also said that key was invented by Theodore of Samos in the 6th century BC.
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Also called post sent through a postal system
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The stuff of healing and health care
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Process light waves to enhance an image for viewing,
or analyze light waves (or photons) to determine characteristic properties.
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The telephone in all its guises
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Illuminators for streets, parking lots, malls, etc.
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Bridges, dams, monuments, building, houses, etc.
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Implements use to build structures
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