What is "myflash", "myiphone" and "mytest"?

I notice that in the compose message thing above. What are they?

[myflash=][/myflash]

[myiphone=][/myiphone]

[mytest=][/mytest]

Good question. I have absolutely no idea. And I'm even more surprised that during my whole time on the forum you are the first person who has asked!

Probably googling the functions of the reply aspect of the phpBB style board might be able to give some clues. I'm pretty tired though but I might do that later because now I'm curious...