* It's a regional or local sign: Some signs vary depending on the region or community.
* It's a personal sign: Individuals may create their own signs for specific words or concepts.
* It's a gesture, not a sign: The movement could be a gesture that has no specific meaning in sign language.
To get a definitive answer, you'd need to know:
* Who is using the sign? If it's someone you know, ask them what it means.
* The context: What were they talking about or doing when they used the sign?
Without more information, it's impossible to say for sure what the sign means.