A solo dinger counts for one

• Box-score column header
• Baseball slugger's statistic: Abbr
• Abbr. on a Topps card
• A run that is the result of the batter's performance
• DH's stat
• Hitter's no
• Result of a blooper, maybe: Abbr
• Credit for driving people home?: Abbr.
• Royal stat

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also R.B.I. , in baseball, 1947, short for run batted in .