A teacher of practical anatomy.

Teaching staff who demonstrate practical experiments in courses such as science.

a teacher or teacher's assistant who demonstrates the principles that are being taught

Counselor/staff member who is the teacher or guide for a lodge.

a pen or pencil that has cutouts, or that is made of transparent materials

a pen constructed of clear acrylic and standard trim

a pen or pencil that allowed salesmen to demonstrate to prospective buyers how the item worked. Usually made of clear, transparent plastic but can also be a "normal" pen with cut away sections to reveal the inner workings of the pen or pencil.

Writing instruments (fountain pens, ballpoints, pencils) made of transparent materials are known as Demonstrator. Also pens or pencils that has cutouts. Primarily manufactured for dealers to demonstrate their function.

Used for describing the level of development of an occurrence, usually an application. A demonstrator (or demo version) is an early stage of a product, where it is only partially developed for showcasing and testing purposes. A prototype is a more advanced stage of development. See also: prototype, occurrence Also used as a genre of document which illustrates the "look and feel" of a product, often a software application.

a brake-by-wire prototype in a laboratory environment

A prototype application developed in a project for Validation purposes.

a vehicle assigned by a dealer for the purpose of demonstrating qualities and characteristics common to vehicles of the same or similar model and type

A vehicle used by a car dealer to demonstrate the make and model to customers and used for test drives.

model who shows use of product at a trade show or store.