Yes, it is possible to use an SSL certificate on multiple servers or domain names. There are two ways to do this:

1. Wildcard SSL Certificate: This type of certificate can be used on an unlimited number of subdomains of a main domain. For example, if you have a wildcard SSL certificate for *.example.com, it can be used on www.example.com, shop.example.com, etc.

2. Multi-Domain SSL Certificate (also known as SAN Certificate): This type of certificate can be used on multiple domain names and subdomains. For example, if you have a Multi-Domain SSL certificate, it can be used on example.com, example.net, etc.

It's important to note that sharing an SSL certificate between multiple servers or domain names may potentially lead to security issues. If one of the servers or domain names is hacked, it could compromise all other servers and domain names sharing the same certificate. To avoid this, it is recommended to use a separate SSL certificate for each server and domain name.