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.
Plone is a powerful and flexible, enterprise-quality content management system that is easy for developers to download and install, and easy for end-users to use. Plone lets non-technical people create and maintain website content using only a web browser.
plectrum - a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument. plectron, pick. device - an instrumentality invented for a particular purpose; the device is small enough to wear on your wrist; a device intended to conserve water. guitar pick - a plectrum used to pluck a guitar.