Hello Steemians
This is my 21st entry into the "alphabetartchallenge" Challenge hosted by 
The link to the challenge is shown below:
https://steemit.com/alphabetartchallenge/@tonyr/can-you-complete-the-alphabetartchallenge-in-2018
It is now Day 21, and the letter is 'U", Unobtanium
The "Unobtanium" symbol looks like this:
Source: https://coinmarketcap.com/currencies/Unobtanium/