Sorry, thought you knew - it stands for Knit A Long. Sometimes that can be where people work on the same pattern for themselves and can exchange help and advice, sometimes people will knit individual squares for blankets to be donated. There's been some that are for shawls - someone starts one, works a few inches or several rows, then sends it on to someone else who does the same and sends it to another and so on. Then the finished item is donated to charity.
sue- knitting heretic