squads

Leave squad and join an existing squad, you will not be squad leader.

Create a squad, or be 2nd in line when the squad leader leaves a squad. If you're appointed to a squad, whoever has been there the longest in the match will be the leader.

Don't do it!

If you lock a squad you will not get the squad specializations (grenades, cover, suppress, explosives, sprint, etc) that new squad members would bring and share with all players in your squad. You are putting the entire team at a disadvantage by locking
a squad! Make sure you are all using different squad specializations otherwise that is another disadvantage for squad and team!

I think your talking about Squad Perks, The symbols show you what Squad Perks your Squad Mates are using. For example, if it shows the Sprint symbol then someone on your squad is using Squad Sprint, so everyone in your squad also as the sprint perk.

If you then choose Squad Extra Ammo for example, then you and your Squad as Extra Ammo and Sprint, However if you see three symbols the same, then three people in your squad are using the same Squad perks (which is pointless as they don't stack on top of each
other, meaning if everyone is using Squad Sprint, it dosen't make you three times faster).

If done right then a Squad of 4 players can have and use 4 perks.

man the squad spawn ribbon u need to kill the squad enemy

for example::: if u are in the squad alpha kill 2 enemies in the squad alpha enemy