The Association for Computing Machinery, the world's oldest and largest educational and scientific computing society. Publishes "Communications of the ACM" and several other scholary journals. Also maintains a number of SIGs. Organizes a number of conferences throughout the year.

According to Imago they also host a programming contest.

Audio Compression Manager, the model used by Microsoft Windows to manage various audio codecs.

This allows conversion of arbitrary format audio data to PCM and vice versa by an ACM-compliant application if an appropriate ACM codec is installed.

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