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防御率 (ゴールキーパー)
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Wikipedia definition
1. Goals against average​Goals Against Average (GAA) is a statistic used in ice hockey, water polo, lacrosse, and football that is the mean of goals allowed per game by a goaltender. For ice hockey, it is calculated per game by dividing the number of goals against by the number of minutes played in the game then multiplied by 60. For a season, divide the total number of goals against by the result of the total number of minutes played (also known as time on ice) divided by 60.
Read “Goals against average” on English Wikipedia
Read “防御率 (ゴールキーパー)” on Japanese Wikipedia
Read “Goals against average” on DBpedia

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