Is there a tag that works as a "and/or"

Tagging Discussion » Is there a tag that works as a "and/or" Search Posts
Background Pony #A0AA
Lets say i want to search rainbow dash, and/or fluttershy, not having them necessarily be on the same image, just searching both of them instead of having two tabs with two different searches. Is there such a tag?
Interested in advertising on Derpibooru? Click here for information!
Champions of Equestria

Derpibooru costs over $25 a day to operate - help support us financially!

Syntax quick reference: **bold** *italic* ||hide text|| `code` __underline__ ~~strike~~ ^sup^ %sub%

Detailed syntax guide