What are those vertical planks with names called?

[Lomaster]

Have no image to post here, but they are generally arranged in rows on a wall at some collective use facilities (workplaces, sports clubs etc.)　and look like this:
==========================
|氏| |氏| |氏| |氏 | |氏| |氏| |氏| |氏| |氏| <- one row of vertical planks
|名| |名| |名| |名| |名| |名| |名| |名| |名|
==========================
|氏| |氏| |氏| |氏 | |氏| |氏| |氏| |氏| |氏| <- another row of vertical planks
|名| |名| |名| |名| |名| |名| |名| |名| |名|
==========================
I've never seen more than two rows so far.
Oh, and i also believe they are two-sided planks. The name on the one side is in black paint while on the other side it is in red.

 

[Mike Cash]

Don't know what they're called, but the purpose is to show who is there and who is absent/away. Each person turns their own card to show their status. The different colors make it easy to see at a glance each person's status. The actual name of the board may vary slightly according to where it is used.

 

[Lomaster]

Thanks for clarifying their purpose Mike. Actually i could make an assumption of their purpose from as little observation of people interacting with the planks as i had.

I'm still looking for the correct term, so if anyone knows what to call them - please leave a reply.

 

[Mike Cash]

The individual planks are just 札 or 名札. I think the whole board as a system is a 出退表示bor 出退表示盤. The part before 表示 could change depending on the nature of the location. I remember seeing one at the entrance to a tunnel construction site that was labeled 入坑者表示 or something like that, for example.

 

[Lomaster]

That would be it! Thank you for your effort Mike, appreciate that.

 

[Toritoribe]

出欠名札 is also used.

 

[Lomaster]

@Toritoribe, Will remember that as well, thanks.