It stands for Line 2 (well actually technically Line 1, but means you've got the option of having Line 2 enabled, and would show the icon but with a 2 next to it when on the other line), which, according to the advertising blurb on Orange, "is Orange's way of letting you keep two types of call separate. It's like having two phones in one, with separate numbers and bills. It's great for keeping your work and personal calls separate, and there are other advantages."
So basically it's like having a second line for your mobile phone.
I've no idea if Voda etc support Line 2, but chances are most users won't use it or know of it.
It's fairly easy to get rid of the icon, go to the Useful Motorola Tools (http://www.mob453.com/forum/viewtopic.php?t=446) thread and download the Motorola Tool program. This will allow you to edit certain files (seems) on your phone to remove the icon/disable it.
Let me know if you want a more detailed explaination as there's a bit more to it than that, however I'm off to bed now so will post more info in the morning if required!
Aleco, yeah.. when i wake up this morning the icon dissapear~~ good news tho~~ ^^ well, im on voda not orange...

about the seem stuff, i have got the p2kman and the xvi32 from the xl8r website and i have edit some of my seem.
well, im sure u know tat combi of GI9V6000000A0E9 and 4AR does not store inbox in the phone but sim rite? i manage to use the seem guide to change the inbox storing in the sim to the phone ^^
not just that, before i flex/flash to the current ver. i use the combi of what u have on urs( i know it from reading the whole forum).

but i found out that the multimedia space of ur combi just accept up to 5446kb capacity. for my mobile, im not sure bout urs.. but when i flex/flash to my current ver. my multimedia capacity increase to 6036kb which is very good indeed ^^ i can store more video file in my phone now, i just hope they will produce a better ver of the flex and flash which can store up to 10 or 20 MB space... heheheh
hmm about the v620, i've heard bout it in the howardforum, its just release in the state isnt it ?and i saw the model, its almost the same with the v600, nothing much diff...

about the phone feature, i have absolutely no idea...

have u got any clue ?

how much is the phone capacity? and etc..

u mean we can flash it to 55R(v620 model flash) ? hmm....
oh.. well, im a bit comfuse with the seem editing part.. hahaha.... lots of coding which i could not understand. i just refer to the map provide by xl8r but still not really understand bout it, im not sure bout the #bit but i think i can understand tat hex=offset. m i rite?
anyway~ 10x for ya help ^^