Everyone I know from school (terps and ASL teachers) just finger spells it. I saw that sign during the ASL class in my classroom, and the deaf teacher, 2 deaf students, and super amazing terp were discussing it and none had seen that before.
I saw this sign for the first time when i first watched the prom episode on switched at birth. Most of my deaf friends fingerspell it. I usually do too. I asked my mom if she knew that sign and she said she probably has but she fingerspells it. The ASL teacher at my high school teaches that sign so I don't really know how Prom became into that sign. I'm curious to know why.
Hey all, interesting that this came up! I live in the area of St. Rita's school for deaf and have always been told that it is a St. Rita's sign. People from St. Rita's around here use that sign; others who did not go to school there tend to FS it. lol around here, St. Rita's has their own sign dialect.