what is this? (pic included)

[patey]

i know i could go to the store i bought my phone from but i'm currently located about 3 or 4 hrs from there right now so i figured id post here see if any of you nice folks can help me out ive been browsing around these forums for months now learning to flash new roms to my phone,learning to install games...solving general problems but i was looking the other day and i have no idea what this little card is,at first i assumed it was an sd card but it looks nothing like the ones i googled. can anyone help? (its wierd...absolutely no writing on it)