[@Sky Blue] It looks like this, but there also Vector Prime symbol engrave on it.
[img]https://th.bing.com/th/id/R.3284ce0a34680c45ed66014b01b5b53e?rik=a8ntpWtP0nMAYA&pid=ImgRaw&r=0[/img]

Here's Vector Prime symbol if you dont know how it's look like:
[img]https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRM2_eGTzv7QjR3DRFo3KvxgOIrTLxePcmCUzSdYpxXl5G9ldE_[/img]