The phrase "microwave safe glass bowl" means that the bowl is designed to be used in a microwave without getting damaged or causing harm to the food or yourself. Full definition
Begin by melting the 4 ounces of chocolate in a microwave safe glass bowl in 20 second intervals until smooth. (bakingandboys.com)
Melt about one cup of the chips in a microwave safe glass bowl, starting at 30 seconds, then stir, and if needed, continue to microwave for additional periods of 20 seconds, stirring after each time. (dishinanddishes.com)
In a microwave safe glass bowl, melt the butter and coarsely chopped chocolate on 50 % power for 2 minutes. (sunnysideupsd.com)