According to Snapchat Support, the full grey arrow on Snapchat means that either a friend request is still pending, or a friend has removed/blocked you from their Snapchat account. (Ouch)
An empty grey arrow may mean that a pending friend request either has expired or was denied.
Wondering how to know if someone follows you on Snapchat without following them? Check out our other super helpful Snapchat articles!
Have more Snapchat questions? Comment below and let us know! We'll do our best to answer your questions.