Achievement 4:

This achievement 4 is basically to teach new user about the use of different special tag which helps to alter and manage the text and video.

Ethereum :

Let me give you brief about the Ethereum. I have been investing in Ethereum and trust me you should too.( Not financial advice) but Quietly, subtly, and without contest, Ethereum is currently under a sustained attack that has been ongoing for months.

Long considered the king of the dApps, Ethereum is the one that other blockchain platforms seek to dethrone in their own attempts at ascension. Hence the well-known term – Ethereum Killer – which is often self-applied by ambitious crypto projects looking to punch above their weight.

While those punches have thus far failed to land, it looks like Ethereum is now being assaulted on a completely different front by an unexpected foe: Binance.
^Source

So basically this Dimond shape denotes Ethereum. This is beautiful picture of Ethereum token.

Table of coin change in %:

COINS	CHANGES(%)
Bitcoin	5%
Ethereum	18%