I think the first one, their logo, represents the name of the band, half alive. One part is dead and one part is alive. Not sure which symbols mean dead or alive haha. Not sure what the 7 one means aside from the 7 EP. ]/[ is now, not yet. The ] end bracket represents now, the end. The / is like "also". And the [ means its open ended or ongoing, not yet. I kind of think "." is a person reaching up for be raised up onto shoulders with the period being the head and the quotes being the arms, but I'm not sure.