They made Azov into a core by merging it with other units, now called the 1st Azov Core, hence the “1” in the logo.
This is, btw, a different unit from the 3rd Assault Brigade, which is also often referred to as 3rd “Azov” Brigade, because it was created by Azov veterans, and their three stripe logo is clearly based on the Azov wolfsangel.
They made Azov into a core by merging it with other units, now called the 1st Azov Core, hence the “1” in the logo.
This is, btw, a different unit from the 3rd Assault Brigade, which is also often referred to as 3rd “Azov” Brigade, because it was created by Azov veterans, and their three stripe logo is clearly based on the Azov wolfsangel.