4th millennium BC. The 4th millennium BC spans the years 4000 through 3000 BC. Some of the major changes in human culture during this time included the beginning of the Bronze Age and the invention of writing, which played a major role in starting recorded history.
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Plectrum is a generic label for flat tools that are used to strum or pluck stringed instruments. Note that the correct plural for plectrum is plectra, but many still refer to them as plectrums. To reduce the confusion, guitarists refer to guitar plectrums as guitar picks. The Plectra we featured comes in various sizes and shapes, so it will do you well to check available sizes and shapes that fit your needs.