Cherry is a brand of rivets made for the aerospace industry. They have now changed their name to Cherry Aerospace. Buck rivets are frequently used in the construction of metal aircraft and coaches. These require access to both sides of the rivet. A bucking bar is placed on the inside of the rivet and a rivet gun is used on the outside to drive the rivet home. This method will not work once the inside is no longer accessible. Therefore typically rivets that fail are replaced with blind rivets. Blind or pop rivets, which can be installed without access to both sides, typically leave a hole in the end of the rivet after installation. A cap is available to dress up the end of the blind rivet making it look like a buck rivet (i.e. a nice rounded head). Therefore, these caps are frequently called cherry caps.
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