This brand name is related to the word "poster".
The name "postermo" has eight characters and three syllables. Leading companies using three syllable names include Mastercard, Verizon and KFC.
Postermo.com is a .com domain. Dot com domains are the most valuable domain extension in the world, used by famous websites like google.com. Once you own a .com, it will be much easier to rank for your own name in Google.
This domain was first registered in August 2016. Older domains have an advantage when ranking in search engines.