FourCC
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✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.
FourCC is a habit, originally from Mac filesystems (but there now deprecated),
to represent types with a four-byte sequence - that is often also restricted in value to be not any byte values but just ASCII character.
This later carried into
- various file formats, especially IFF/RIFF based ones (as the type of these TLV-style formats).
- DirectX, picking up data formats from AVI and others
Which of those come from ad-hoc historical convenience, or just from preference, will varies per file type.