I checked ISWA 2010 and a hyper-extended L is not yet part of the system. I'd just use an L for now.
From: Natasha Escalada-Westland <[log in to unmask]>
To: [log in to unmask]
Sent: Sun, February 27, 2011 6:16:06 AM
Subject: Handshape available?
What symbol from SignMaker in SignPuddle would you use to write the
attached handshape? It is part of a sign describing a hoop or circle and is a
very slightly bent L shape.