No idea how to create this action

I search a blueprint sample on the internet but I have no idea how to create one of the action.

see below:

I don’t know the action which between “Previous Action” and the “OR” action. Seem like this symbol " " .
“Previous Action” is Byte type.

You need to create a “Enumaration”, inside you can set “Idle”, “Stop” etc, then you can use == to pull selections, from a variable of type EnumarationName

Thank you very much! I done it.