Question for regular bus riders (best, metro, pay)

[enlightened]

For those of you who ride the bus regularly, could you tell me what the orange, flourescent-looking card is that some people present when they get on the bus? I've noticed they don't pay anything when they present it. I thought maybe it was a senior card of some sort but I've seen much younger folks presenting them, too. Any idea what it is?

I'd like to get as close to possible to a monthly pass for the bus, but I think the best I can do is a Smartrip card, which I already have.

[Carrot2000]

It's probably a weekly bus pass: Metro - Metro passes and farecards (http://www.wmata.com/riding/passes.cfm - broken link)

[enlightened]

ahh geez.
I feel simple. I was looking for that link on the website but kept going back to the fares and passes site. Needed to take it one step further. Thanks so much! :-)