Simplify the following text for a Grade 12 native English-speaking person.
Original: When signing their name for Indian business , a British King-Emperor or reigning Queen-Empress used the initials R I ( Rex\/Regina Imperator\/Imperatrix ) or the abbreviation Ind. .
Simplified: When signing their name for Indian business , a British King-Emperor or the Queen-Empress used the initials R I ( Rex\/Regina Imperator\/Imperatrix ) or the shorter version Ind. .