origin of whoosh

Katy, please forgive me if this is a silly question and has a simple answer, but when Simon sign's off he writes "whoosh s" What does Whoosh stand for - I have been a fan since the beginning and was lucky to have met Simon on several occasions. He signed a photo for me and wrote what I think is "whoosh" on the photo of the two of us - I could not figure out what he wrote, and then put 2 and 2 together when I saw his sign off - hope you can help. Thanks, Jenny

"Quite simple, it's shoohw backwards.whoosh, s"