A colleague has an accessory with a collection of Marvel Character logos and we haven't been able to identify one, with Google not yielding anything helpful, It has a Hydra and an Avengers logo so maybe it's not a hero, but a group it represents. It also has a Loki helmet so villains are also a possibility.
This also isn't like official merch so it might be an unofficial logo.
Please see image below. The unknown one is circled in red.