Type Specimen is the way of knowing what a typeface looks like before going ahead and purchasing it. The specimen posters display the full character complement; it is more like a sample of the typeface arranged in different manner and sizes to show the potential of the fonts.
Also here are some examples of students type specimen poster from the previous years.
Below I have various typographic poster examples, I have found and redrew their layouts in order to learn the grid systems of each poster. Also, I have chosen specific ones as I found them quite abstract and slightly unusual.
Posters by Luck e Hess on Behance www.redbubble.com/shop/expressivetypography+posters#_/. www.thinkingwithtype.com/misc/poster_project.hym/. https://cias.rit.edu/faculty-staff/160/student/45/. http://designspiration.net/search/saves/page/1/?q=type%20specimen%20poster/. https://www.etsy.com/listing/87618950/11x14-inch-suisse-swiss-helvetica-type/. https://www.behance.net/gallery/8392803/Futura-Type-Specimen-Posters.