• The Domain Name shall contain only letters (A to Z), numbers (0 to 9), the sign (-), or a combination of letters, numbers, and the sign (-), to be in line with the Internationalized Domain Name. 
• The Domain Name shall not contain the sign (-) in the third or fourth position unless it corresponds to an Internationalized Domain Name in ASCII encoding. • The Domain Name shall not start or end with the sign (-). 
• The Domain Name shall not be a reserved name.
• The Domain Name shall not contain any spaces.

As per the Law in Bahrain, the Domain Name owner needs to take into consideration the following when choosing a Domain Name:
1- Not to prejudice any intellectual property right of any person, whether natural or juristic entity. 
2- Not to violate the Law, public morals, or public order, and not to be used for illegal purposes.
 3- Not to offend the name of any country, city, celebrity, family, or famous trademarks. 
4- It shall not involve any of the following: 
1) Anything that would compromise the national security or military secrets or infringe on the dignity and prestige of the Kingdom of Bahrain in any way. 
2) Anything that would harm the national interests. 
3) Anything that would create any form of discrimination among members of the community. 
4) Anything that would incite terrorism, violence, or crime, or threaten public safety and security. 
5) Anything that would spread rumors, disturb and destabilize the community and public opinion. 
6) Anything that would offend or harm the reputation of others or infringe on their legal rights and interests. 
5- Any other requirements approved by the Authority, in light of whatever may be issued by the ICANN

URL stands for Uniform Resource Location. By using a URL like http://www.register.bh you are using the domain register.bh to get to the placeholder for www.register.bh.

That the domain name should match their trademark.

As the client intends to operate in Bahrain, hence the client should consider applying for the Domain Name “.bh”.