What do all those microSD and SD card numbers and letters mean?

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SD vs. SDHC vs. SDXC: Camera card review features

ProGrade Digital microSD Memory Card - V60 microSD Card for DSLR and Action Cameras - High Speed Transfer of Files & Large Storage - Up to 250MB/s Read and 130MB/s Write

What do all those microSD and SD card numbers and letters mean?

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SD Cards Explained

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Symbols on SD Cards Explained: What the Numbers And Codes Mean - SalvageData